Use sonaRelease command in release workflow

- Replace publishSigned with sonaRelease for proper release flow
- sonaRelease handles both publishing and release to Central Portal

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: xerial

.github/workflows/release.yml

@@ -31,4 +31,4 @@ jobs:
           PGP_PASSPHRASE: ${{ secrets.PGP_PASSPHRASE }}
           SONATYPE_USERNAME: '${{ secrets.SONATYPE_USERNAME }}'
           SONATYPE_PASSWORD: '${{ secrets.SONATYPE_PASSWORD }}'
-        run: ./sbt publishSigned
+        run: ./sbt sonaRelease