build(deps): bump docker/setup-buildx-action from 3 to 4

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 3 to 4.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v3...v4)

---
updated-dependencies:
- dependency-name: docker/setup-buildx-action
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci-helm-deploy-nginx.yml

@@ -18,7 +18,7 @@ jobs:
         uses: docker/setup-qemu-action@v3
       # https://github.com/docker/setup-buildx-action
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
       - name: GoReleaser
         uses: goreleaser/goreleaser-action@v7
         with:

.github/workflows/ci-kustomize-deploy.yml

@@ -18,7 +18,7 @@ jobs:
         uses: docker/setup-qemu-action@v3
       # https://github.com/docker/setup-buildx-action
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
       - name: GoReleaser
         uses: goreleaser/goreleaser-action@v7
         with:

.github/workflows/release.yml

@@ -21,7 +21,7 @@ jobs:
         uses: docker/setup-qemu-action@v3
       # https://github.com/docker/setup-buildx-action
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
       - name: Login to DockerHub
         uses: docker/login-action@v3
         with: