Update actions/cache action to v4

Author: renovate[bot]

.github/workflows/buildDockerImage.yml

@@ -42,7 +42,7 @@ jobs:
         uses: docker/setup-buildx-action@v1
 
       - name: Cache Docker layers
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}