chore(deps): bump actions/cache from 4 to 5 (#129)

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Author: dependabot[bot]

.github/workflows/docs.yml

@@ -41,7 +41,7 @@ jobs:
           python-version: '3.11'
       - run: echo "cache_id=$(date --utc '+%V')" >> $GITHUB_ENV 
 
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           key: mkdocs-material-${{ env.cache_id }}
           path: ~/.cache