chore(ci): Bump docker/build-push-action from 5 to 6 (#2)

Safe dependency bump: docker/build-push-action 5 → 6

Author: dependabot[bot]

.github/workflows/docker.yml

@@ -45,7 +45,7 @@ jobs:
             type=sha,prefix=sha-
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}