chore(deps): update docker/metadata-action action to v6

Author: renovate[bot]

.github/workflows/docker.yml

@@ -26,7 +26,7 @@ jobs:
 
       - name: Docker meta (base)
         id: meta-base
-        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
+        uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf # v6.0.0
         with:
           images: |
             clevyr/php
@@ -42,7 +42,7 @@ jobs:
 
       - name: Docker meta (onbuild)
         id: meta-onbuild
-        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
+        uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf # v6.0.0
         with:
           images: |
             clevyr/php