Update actions/cache action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
 
       - run: uv sync --locked --all-extras --dev
 
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           path: ~/.cache/pre-commit
           key: pre-commit-${{ env.pythonLocation }}-${{ hashFiles('.pre-commit-config.yaml') }}