Update docker/metadata-action action to v6

Author: renovate[bot]

.github/workflows/continuous_integration.yml

@@ -311,7 +311,7 @@ jobs:
           fetch-depth: 0
       - name: Docker Meta
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: ${{ env.BUILD_KIT_IMAGE_NAME }}
           sep-tags: ","

.github/workflows/deploy-single-docker-image.yml

@@ -199,7 +199,7 @@ jobs:
         echo "platforms=${result}" >> $GITHUB_OUTPUT
     - name: Extract metadata
       id: meta
-      uses: docker/metadata-action@v5
+      uses: docker/metadata-action@v6
       with:
         sep-tags: ','
         images: |