Build(deps): Bump docker/setup-buildx-action from 3 to 4 (#988)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/docker-milestone-release.yml

@@ -56,7 +56,7 @@ jobs:
           platforms: linux/amd64,linux/arm64,linux/arm/v7
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Log in to Docker Hub
         uses: docker/login-action@v4

.github/workflows/docker-snapshot-release.yml

@@ -72,7 +72,7 @@ jobs:
           platforms: linux/amd64,linux/arm64,linux/arm/v7
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Log in to Docker Hub
         uses: docker/login-action@v4