Add passing 3.11 CI by exempting blackd tests (psf#3234)

- Had to exempt blackd tests for now due to aiohttp
  - Skip by using `sys.version_info` tuple
  - aiohttp does not compile in 3.11 yet - refer to psf#3230
- Add a deadsnakes ubuntu workflow to run 3.11-dev to ensure we don't regress
  - Have it also format ourselves

Test:
- `tox -e 311`

Co-authored-by: Cooper Ry Lees <me@wcooperlees.com>
Co-authored-by: Richard Si <63936253+ichard26@users.noreply.github.com>

.github/workflows/test-311.yml

@@ -0,0 +1,57 @@
+name: Partially test 3.11 dev
+
+on:
+  push:
+    paths-ignore:
+      - "docs/**"
+      - "*.md"
+
+  pull_request:
+    paths-ignore:
+      - "docs/**"
+      - "*.md"
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  main:
+    # We want to run on external PRs, but not on our own internal PRs as they'll be run
+    # by the push to the branch. Without this if check, checks are duplicated since
+    # internal PRs match both the push and pull_request events.
+    if:
+      github.event_name == 'push' || github.event.pull_request.head.repo.full_name !=
+      github.repository
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11.0-rc - 3.11"]
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install tox
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade tox
+
+      - name: Run tests via tox
+        run: |
+          python -m tox -e 311
+
+      - name: Format ourselves
+        run: |
+          python -m pip install .
+          python -m black --check src/

CHANGES.md

@@ -69,6 +69,8 @@
 
 <!-- Changes to how Black is packaged, such as dependency requirements -->
 
+- Python 3.11 is now supported, except for `blackd` (#3234)
+
 ### Parser
 
 <!-- Changes to the parser or to version autodetection -->

setup.py

@@ -127,6 +127,7 @@ def find_python_files(base: Path) -> List[Path]:
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3 :: Only",
         "Topic :: Software Development :: Libraries :: Python Modules",
         "Topic :: Software Development :: Quality Assurance",