devel/go-git: Update to 5.5.0
- broken on i386, issue: https://github.com/pjbgf/sha1cd/issues/6
- switch back to "gomod-vendor" method because GO_MODULES is failing, issue: https://github.com/go-git/go-git/issues/626
ChangeLog: https://github.com/go-git/go-git/releases/tag/v5.5.0