Remove GH_USER from README

Author: razor-x

README.md

@@ -214,7 +214,6 @@ require a user with write access to the repository.
 including access to trigger workflows.
 Set these additional secrets to enable the action:
 
-- `GH_USER`: The GitHub user's username.
 - `GH_TOKEN`: A personal access token for the user.
 - `GIT_USER_NAME`: The GitHub user's real name.
 - `GIT_USER_EMAIL`: The GitHub user's email.