devel/git-subrepo: update to 0.4.6
ChangeLog: https://github.com/ingydotnet/git-subrepo/releases/tag/0.4.5
https://github.com/ingydotnet/git-subrepo/releases/tag/0.4.6
PR: 275108
Approved by: jhb (maintainer)
Sponsored by: Rubicon Communications, LLC ("Netgate")