update test config

.github/workflows/tests.yaml

@@ -42,14 +42,5 @@ jobs:
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: pip|${{ runner.os }}|${{ matrix.python }}|${{ hashFiles('setup.py') }}|${{ hashFiles('requirements/*.txt') }}
-      - name: set full Python version in PY env var
-        # See https://pre-commit.com/#github-actions-example
-        run: echo "PY=$(python -VV | sha256sum | cut -d' ' -f1)" >> $GITHUB_ENV
-      - name: cache pre-commit
-        uses: actions/cache@v2
-        with:
-          path: ~/.cache/pre-commit
-          key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
-        if: matrix.tox == 'style'
       - run: pip install tox
       - run: tox -e ${{ matrix.tox }}