fix(deps): update module golang.org/x/oauth2 to v0.21.0#371

DiogoFerrao merged 2 commits intomainstackitcloud/stackit-cli:mainfrom

renovate/golang.org-x-oauth2-0.xstackitcloud/stackit-cli:renovate/golang.org-x-oauth2-0.xCopy head branch name to clipboard