fix: use brews instead of homebrew_casks in goreleaser config

Formula (brews) is correct for CLI tools. Casks are for GUI apps.
This was causing the tap entry to land under Casks/ instead of Formula/.

Author: dedene

.goreleaser.yaml

@@ -31,7 +31,7 @@ archives:
         formats:
           - zip
 
-homebrew_casks:
+brews:
   - repository:
       owner: dedene
       name: homebrew-tap