Bump actions/cache to v3 (latest)

Author: billz

.github/workflows/build_docker_image.yml

@@ -70,7 +70,7 @@ jobs:
 
       # Use cache image for quicker build time.
       - name: Cache Docker layers
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-buildx-${{ github.sha }}