Bump docker/setup-buildx-action from 2 to 3 (#125)

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

.github/workflows/build.yaml

@@ -21,7 +21,7 @@ jobs:
       - run: echo "major=`mvn help:evaluate -Dexpression=version.org.keycloak -DforceStdout -q | cut -d. -f1`" >> $GITHUB_ENV
       - run: mvn -B -ntp prepare-package -Dimage.tag=${{ env.version }}-${{ env.timestamp }}
       - uses: docker/setup-qemu-action@v3
-      - uses: docker/setup-buildx-action@v2
+      - uses: docker/setup-buildx-action@v3
       - name: docker/login-action docker.io
         uses: docker/[email protected]
         with: