fix(brew)!: rename buf alias to bfu

BREAKING CHANGE: rename `buf` alias to `bfu` to avoid conflicts with
protobuf tool

plugins/brew/brew.plugin.zsh

@@ -35,7 +35,7 @@ alias bugbc='brew upgrade --greedy && brew cleanup'
 alias bubo='brew update && brew outdated'
 alias bubu='bubo && bubc'
 alias bubug='bubo && bugbc'
-alias buf='brew upgrade --formula'
+alias bfu='brew upgrade --formula'
 alias buz='brew uninstall --zap'
 
 function brews() {