Remove Homebrew tap from goreleaser config

Our tap is now deprecated in favor of `gh` from homebrew-core

.goreleaser.yml

@@ -50,32 +50,6 @@ archives:
     files:
       - LICENSE
 
-brews:
-  - name: gh
-    ids: [nix]
-    github:
-      owner: github
-      name: homebrew-gh
-    skip_upload: auto
-    description: GitHub CLI
-    homepage: https://github.com/cli/cli
-    folder: Formula
-    custom_block: |
-      head do
-        url "https://github.com/cli/cli.git", :branch => "trunk"
-        depends_on "go"
-      end
-    install: |
-      system "make", "bin/gh", "manpages" if build.head?
-      bin.install "bin/gh"
-      man1.install Dir["./share/man/man1/gh*.1"]
-      (bash_completion/"gh.sh").write `#{bin}/gh completion -s bash`
-      (zsh_completion/"_gh").write `#{bin}/gh completion -s zsh`
-      (fish_completion/"gh.fish").write `#{bin}/gh completion -s fish`
-    test: |
-      help_text = shell_output("#{bin}/gh --help")
-      assert_includes help_text, "Usage:"
-
 nfpms:
   - license: MIT
     maintainer: GitHub