Bump docker/setup-buildx-action from 2 to 3

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 2 to 3.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v2...v3)

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

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

.github/workflows/docker-builds.yml

@@ -31,7 +31,7 @@ jobs:
         uses: actions/checkout@v4
       # https://github.com/docker/setup-buildx-action
       # Set up Docker Buildx - to use cache-from and cache-to argument of buildx command
-      - uses: docker/setup-buildx-action@v2
+      - uses: docker/setup-buildx-action@v3
       - name: Login to DockerHub
         uses: docker/login-action@v2
         if: github.ref == 'refs/heads/master'