Update docker/metadata-action action to v6 (#31)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@v6
       - name: Process metadata (tags, labels)
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             ${{ vars.DOCKER_ORGANIZATION }}/${{ env.IMAGE_NAME }}

.github/workflows/publish.yml

@@ -41,7 +41,7 @@ jobs:
 
       - name: Process metadata (tags, labels)
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             ${{ vars.DOCKER_ORGANIZATION }}/${{ env.IMAGE_NAME }}