Where? Pretty much anyone will honor a DMCA takedown. There might be some grey area where some hosts will be better at identifying an invalid/bad-faith one, but this one appears to be valid.
The world is a pretty large place...
You don't need GitHub to publish or host a git repo...
Which is why I never rely solely on commercial cloud services like this for hosting my content.
In addition, they won't even give you any info they hold on the complainant other than that explicitly included in the notice itself, claiming 'data protection' (some troll hit a bunch of my repositories with fraudulent takedowns in two waves, meaning it took about a month before they were all restored)