Attempt to pull new tags if fetching a tag fails

[eliminmax]

Checklist

• Closing issues: r2env add [email protected] fails if ~/.r2env/src/radare2 is older than the 5.9.0 release #36
• Mark this if you consider it ready to merge
• I've added tests (optional)
• I wrote some documentation

Description

I edited the git_fetch function in tools.py, so that if repo.git.checkout(version) fails with a git.GitCommandError, it tries to fetch tags from origin and tries one more time, instead of immediately failing.

I am not super familiar with the GitPython module, but I did not see anything in the docs that would point to cleaner way to do things than pass the --tags flag.

[eliminmax]

Working on investigating the failed checks. Unchecked the "ready to merge" check in the meantime.

I'm currently in the middle of installing older python versions with pyenv to be able to run the tests locally.

[trufae]

Thanks for taking care of this

[trufae]

the "1 C901 'PackageManager.install_package' is too complex (11)" seems like a bad excuse to fail anyway

[trufae]

Merging because the failing tests are also broken on master, so unrelated to your changes