feat(git): add grst alias for git restore --staged (#8932)

Closes #8932

plugins/git/git.plugin.zsh

@@ -236,6 +236,7 @@ alias grrm='git remote remove'
 alias grs='git restore'
 alias grset='git remote set-url'
 alias grss='git restore --source'
+alias grst='git restore --staged'
 alias grt='cd "$(git rev-parse --show-toplevel || echo .)"'
 alias gru='git reset --'
 alias grup='git remote update'