git: add `--no-gpg-sign` to gwip (#6031)

plugins/git/git.plugin.zsh

@@ -261,4 +261,4 @@ alias gupav='git pull --rebase --autostash -v'
 alias glum='git pull upstream master'
 
 alias gwch='git whatchanged -p --abbrev-commit --pretty=medium'
-alias gwip='git add -A; git rm $(git ls-files --deleted) 2> /dev/null; git commit --no-verify -m "--wip-- [skip ci]"'
+alias gwip='git add -A; git rm $(git ls-files --deleted) 2> /dev/null; git commit --no-verify --no-gpg-sign -m "--wip-- [skip ci]"'