pins pre-commit-tool versions

I've run precommit-autoupdate to update black to a current version with an explicit version number. See this issue for reference psf/black#420 (comment)
This allows us to pin the github-actions tool versions as well.

This commit applies the new formatting style directly.

.github/workflows/development_workflow.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/setup-python@v2
         with:
           python-version: ${{ matrix.python-version }}
-      - uses: psf/black@stable
+      - uses: psf/black@20.8b1
 
   flake8:
     runs-on: ubuntu-latest

.isort.cfg

@@ -1,2 +1,3 @@
 [settings]
-line_length=88
+line_length=88
+known_third_party = utils

.pre-commit-config.yaml

@@ -1,17 +1,18 @@
 # isort
+repos:
 - repo: https://github.com/asottile/seed-isort-config
-  rev: v1.9.3
+  rev: v2.2.0
   hooks:
     - id: seed-isort-config
 
 - repo: https://github.com/pre-commit/mirrors-isort
-  rev: v4.3.21
+  rev: v5.6.4
   hooks:
     - id: isort
 
 # black
 - repo: https://github.com/ambv/black
-  rev: stable
+  rev: 20.8b1
   hooks:
     - id: black
       args:
@@ -33,7 +34,7 @@
 
 # flake8
 - repo: https://gitlab.com/pycqa/flake8
-  rev: 3.7.9
+  rev: 3.8.4
   hooks:
     - id: flake8
       args:

src/main.py

@@ -13,7 +13,8 @@
     # run example function
     hello_world_success = hello_world()
     print("Hello World completed successfully!") if hello_world_success else print(
-        "Hello Wold failed!")
+        "Hello Wold failed!"
+    )
 
     # exemplify how to access environment variables
     print("\nEnvironment variable: {}".format(os.environ["TEST_PW"]))

tests/sample_test.py

@@ -12,5 +12,5 @@ def test_sample(self):
         self.assertTrue(True)
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main()