Fix tests when `GIT_AUTHOR_NAME` or `GIT_COMMITTER_NAME` are set#1876

Byron merged 1 commit intoGitoxideLabs:mainGitoxideLabs/gitoxide:mainfrom

joshtriplett:fix-tests-in-environments-with-env-variables-setjoshtriplett/gitoxide:fix-tests-in-environments-with-env-variables-setCopy head branch name to clipboard