Update key to avoid reserved key issue

Signed-off-by: Mathias L. Baumann <[email protected]>

Author: Marenz

.github/workflows/ci.yaml

@@ -88,7 +88,7 @@ jobs:
         uses: actions/cache/restore@v4
         with:
           path: .pytest_cache
-          key: ${{ runner.os }}-pytest-cache-${{ matrix.os }}-${{ matrix.python }}-${{ github.ref_name }}
+          key: ${{ runner.os }}-pytest-cache-${{ matrix.os }}-${{ matrix.python }}-${{ github.ref_name }}-v2
 
       # Run nox session
       - name: Run nox
@@ -108,7 +108,7 @@ jobs:
         uses: actions/cache/save@v4
         with:
           path: .pytest_cache
-          key: ${{ runner.os }}-pytest-cache-${{ matrix.os }}-${{ matrix.python }}-${{ github.ref_name }}
+          key: ${{ runner.os }}-pytest-cache-${{ matrix.os }}-${{ matrix.python }}-${{ github.ref_name }}-v2
 
   # This job runs if all the `nox` matrix jobs ran and succeeded.
   # It is only used to have a single job that we can require in branch