Add flake8<6 pin for broken plugins

[dopplershift]

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

Backporting (so to speak) conda-forge/flake8-copyright-feedstock#5 and conda-forge/flake8-quotes-feedstock#22.

The diff:

Downloading: https://conda.anaconda.org/conda-forge/noarch/repodata_from_packages.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/noarch/repodata.json.bz2
noarch::flake8-copyright-0.2.0-py_1.tar.bz2
-    "flake8",
+    "flake8 <6",
noarch::flake8-copyright-0.2.2-py_0.tar.bz2
-    "flake8",
+    "flake8 <6",
noarch::flake8-copyright-0.2.3-pyhd8ed1ab_0.tar.bz2
-    "flake8",
+    "flake8 <6",
noarch::flake8-quotes-3.3.1-pyhd8ed1ab_0.tar.bz2
-    "flake8",
+    "flake8 <6",
Downloading: https://conda.anaconda.org/conda-forge/linux-64/repodata_from_packages.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/linux-64/repodata.json.bz2
linux-64::flake8-copyright-0.2.0-py27_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp27mu"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp27mu"
+  ]
linux-64::flake8-copyright-0.2.0-py34_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp34m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp34m"
+  ]
linux-64::flake8-copyright-0.2.0-py35_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp35m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp35m"
+  ]
linux-64::flake8-copyright-0.2.0-py36_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp36m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp36m"
+  ]
Downloading: https://conda.anaconda.org/conda-forge/linux-armv7l/repodata_from_packages.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/linux-armv7l/repodata.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/linux-aarch64/repodata_from_packages.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/linux-aarch64/repodata.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/linux-ppc64le/repodata_from_packages.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/linux-ppc64le/repodata.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/osx-64/repodata_from_packages.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/osx-64/repodata.json.bz2
osx-64::flake8-copyright-0.2.0-py27_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp27m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp27m"
+  ]
osx-64::flake8-copyright-0.2.0-py34_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp34m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp34m"
+  ]
osx-64::flake8-copyright-0.2.0-py35_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp35m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp35m"
+  ]
osx-64::flake8-copyright-0.2.0-py36_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp36m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp36m"
+  ]
Downloading: https://conda.anaconda.org/conda-forge/osx-arm64/repodata_from_packages.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/osx-arm64/repodata.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/win-32/repodata_from_packages.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/win-32/repodata.json.bz2
win-32::flake8-copyright-0.2.0-py27_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp27m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp27m"
+  ]
win-32::flake8-copyright-0.2.0-py34_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp34m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp34m"
+  ]
win-32::flake8-copyright-0.2.0-py35_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp35m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp35m"
+  ]
win-32::flake8-copyright-0.2.0-py36_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp36m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp36m"
+  ]
Downloading: https://conda.anaconda.org/conda-forge/win-64/repodata_from_packages.json.bz2
Downloading: https://conda.anaconda.org/conda-forge/win-64/repodata.json.bz2
win-64::flake8-copyright-0.2.0-py27_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp27m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp27m"
+  ]
win-64::flake8-copyright-0.2.0-py34_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp34m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp34m"
+  ]
win-64::flake8-copyright-0.2.0-py35_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp35m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp35m"
+  ]
win-64::flake8-copyright-0.2.0-py36_0.tar.bz2
-  "constrains": [
-    "python_abi * *_cp36m"
-  ],
-    "flake8",
+    "flake8 <6",
-  "version": "0.2.0"
+  "version": "0.2.0",
+  "constrains": [
+    "python_abi * *_cp36m"
+  ]

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.