Update actions/cache action to v5

Author: renovate[bot]

.github/workflows/main.yaml

@@ -41,7 +41,7 @@ jobs:
           python-version: '3.14'
       - run: python3 -m pip install --requirement=ci/requirements.txt
 
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           path: ~/.cache/pre-commit
           key: pre-commit-${{ hashFiles('.pre-commit-config.yaml') }}