fix(ci): skip release-please GitHub release, let GoReleaser handle it

Avoids duplicate releases — release-please creates tags only,
GoReleaser creates the GitHub release with grouped changelogs.

Author: dndungu

release-please-config.json

@@ -4,6 +4,7 @@
       "release-type": "go",
       "bump-minor-pre-major": true,
       "bump-patch-for-minor-pre-major": true,
+      "skip-github-release": true,
       "changelog-sections": [
         { "type": "feat", "section": "Features" },
         { "type": "fix", "section": "Bug Fixes" },