ci: cache lint deps, decrease test timeout (#8494)

.github/workflows/tests.yaml

@@ -29,6 +29,8 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: 3.8
+        cache: pip
+        cache-dependency-path: setup.cfg
     - name: Install requirements
       run: |
         pip install --upgrade pip setuptools wheel
@@ -67,7 +69,7 @@ jobs:
         pip install --upgrade pip setuptools wheel
         pip install -e ".[dev]"
     - name: run tests
-      timeout-minutes: 40
+      timeout-minutes: 20
       run: pytest -nauto -ra --durations 100 --cov=dvc --cov-report=xml --cov-report=term -k "${{ matrix.pytest-filter }}"
     - name: upload coverage report
       uses: codecov/codecov-action@v3