Rewrite git://github.com URLs as https://github.com

[andrewnicols]

See https://github.blog/2021-09-01-improving-git-protocol-security-github/#no-more-unauthenticated-git for more information on this change

[andrewnicols]

This will warn and fix any github URL when:

• fetching any remote using the Git.fetch() where the remore it a git://github.com URL
• updating the tracker

[junpataleta]

Thanks, Andrew. Merged!