Bump docker/metadata-action from 3.3.0 to 3.4.0 (#158)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
 
       - name: Docker Metadata action
         id: meta
-        uses: docker/metadata-action@v3.3.0
+        uses: docker/metadata-action@v3.4.0
         with:
           images: itzg/minecraft-bedrock-server
           flavor: |