fix: use brews instead of homebrew_casks for CLI Homebrew formula

GoReleaser v2 still uses 'brews' as the YAML field name for CLI
formulae (Homebrew struct). The 'homebrew_casks' field is for
macOS installers (.pkg/.dmg).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Peefy

.goreleaser.yml

@@ -30,7 +30,7 @@ archives:
         formats:
           - zip
 
-homebrews:
+brews:
   - name: kcl
     repository:
       owner: kcl-lang