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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -118,7 +118,7 @@ jobs:
 
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: pgautoupgrade/pgautoupgrade
           flavor: |

.github/workflows/dev-build.yml

@@ -41,7 +41,7 @@ jobs:
             # https://github.com/docker/metadata-action
             - name: Extract container metadata
               id: meta
-              uses: docker/metadata-action@v5
+              uses: docker/metadata-action@v6
               with:
                   images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}