Update actions/cache action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -256,7 +256,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Set up docusaurus cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: doc-site/.yarn/.cache/webpack
           key: ${{ runner.os }}-doc-site-docusaurus-${{ github.ref }}