chore(goreleaser): fixing brew github deprecation

The 'github' keyword was replaced by the more generic 'tap' keyword. See here: https://goreleaser.com/deprecations/#brewsgithub

.goreleaser.yml

@@ -39,7 +39,7 @@ nfpms:
   - rpm
 
 brews:
-  - github:
+  - tap:
       owner: norwoodj
       name: homebrew
     folder: Formula