chore(deps): update docker/build-push-action action to v6.18.0 (#20)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/helm-test.yml

@@ -28,7 +28,7 @@ jobs:
               uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
 
             - name: Build Docker image
-              uses: docker/build-push-action@c382f710d39a5bb4e430307530a720f50c2d3318 # v6.0.0
+              uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
               with:
                   context: .
                   load: true