chore(deps): update docker/build-push-action action to v6.18.0 (#304)

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -89,7 +89,7 @@ jobs:
       # https://github.com/docker/build-push-action
       - name: Build and push Docker image
         id: build-and-push
-        uses: docker/build-push-action@v6.16.0
+        uses: docker/build-push-action@v6.18.0
         with:
           context: docker/
           push: ${{ github.event_name != 'pull_request' }}

.github/workflows/pr-docker-image.yml

@@ -37,7 +37,7 @@ jobs:
           echo "PIHOLE_VERSION=$VERSION" >> "$GITHUB_OUTPUT"
 
       - name: Build and push PR Docker image
-        uses: docker/build-push-action@v6.16.0
+        uses: docker/build-push-action@v6.18.0
         with:
           context: docker/
           push: true