Bump docker/build-push-action from 6.16.0 to 6.18.0 (#8392)

Author: dependabot[bot]

.github/workflows/docker-publish.yaml

@@ -22,7 +22,7 @@ jobs:
           username: weaveworkseksctlci
           password: ${{ secrets.DOCKER_HUB_PASSWORD }}
       - name: Build and push Docker image
-        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 #6.16.0
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 #6.18.0
         with:
           context: .
           push: true

.github/workflows/ecr-publish.yaml

@@ -41,7 +41,7 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.REGISTRY_ALIAS }}/${{ env.REPOSITORY }}
 
       - name: Build and push container image to ECR
-        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 #6.16.0
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 #6.18.0
         with:
           context: .
           push: true