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

Author: renovate[bot]

.github/workflows/publish_canary.yml

@@ -39,7 +39,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-buildx-
       - name: Build, tag, and push image to Amazon ECR
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         env:
           ECR_REGISTRY: ${{ steps.login-ecr.outputs.registry }}
           ECR_REPOSITORY: web3inbox-canary