fix: upgrade GoReleaser to v2 for config compatibility

- Use goreleaser-action@v6 with version ~> v2
- Add HOMEBREW_TAP_TOKEN to release workflow

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

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

Author: rebelice

.github/workflows/release.yml

@@ -23,10 +23,11 @@ jobs:
           go-version: '1.21'
 
       - name: Run GoReleaser
-        uses: goreleaser/goreleaser-action@v5
+        uses: goreleaser/goreleaser-action@v6
         with:
           distribution: goreleaser
-          version: latest
+          version: "~> v2"
           args: release --clean
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          HOMEBREW_TAP_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}