If you are on the branch you want to rename:
$ git branch -m new-name
If you are on a different branch:
$ git branch -m old-name new-name
Delete the old-name remote branch and push the new-name local branch.
$ git push origin :old-name new-name
Reset the upstream branch for the new-name local branch, switch to the branch and then:
$ git push origin -u new-name
$ git reset --soft HEAD~
$ git config --global http.extraheader "PRIVATE-TOKEN: YOUR_PRIVATE_TOKEN"
$ git config --global url."[email protected]:".insteadOf "https://gitlab.mycompany.com/"
$ go get gitlab.com/company/private_repo