Update actions/cache action to v4

Author: renovate[bot]

.github/workflows/build-deploy.yml

@@ -22,14 +22,14 @@ jobs:
 
             - name: Docusaurus .docusaurus folder cache
               id: cache-docusaurus-cache
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   path: .docusaurus
                   key: ${{ runner.os }}-docusaurus-cache
 
             - name: Docusaurus build folder cache
               id: cache-docusaurus-build
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   path: build
                   key: ${{ runner.os }}-docusaurus-build