chore: update pre-commit GHA

.github/workflows/main.yml

@@ -15,13 +15,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-python@v2
-    - name: set PY
-      run: echo "::set-env name=PY::$(python -c 'import hashlib, sys;print(hashlib.sha256(sys.version.encode()+sys.executable.encode()).hexdigest())')"
-    - uses: actions/cache@v1
-      with:
-        path: ~/.cache/pre-commit
-        key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
-    - uses: pre-commit/[email protected]
+    - uses: pre-commit/[email protected]
 
   checks:
     runs-on: ubuntu-latest
@@ -33,6 +27,7 @@ jobs:
         - 3.5
         - 3.6
         - 3.8
+
     name: Check Python ${{ matrix.python-version }}
     steps:
     - uses: actions/checkout@v2