fix(homebrew): 🐛 install helpers into Cellar libexec

Author: taygunsavas

.github/workflows/tangle-release.yml

@@ -64,7 +64,7 @@ jobs:
 
             def install
               bin.install "bin/git-tangle"
-              (HOMEBREW_PREFIX/"libexec/tangle").install Dir["libexec/tangle/*"]
+              libexec.install "libexec/tangle"
             end
           end
           RUBY