Update to go-github v50

[ilmax]

Bump go-github to v50.

I run some tests locally via make testacc and beside some 401 because I'm using a fine-grained PAT everything seems ok.

I'm using a fine-grained PAT because I'm the owner of an enterprise and organization in GitHub and I can't limit the scope of the old style PAT to only the test organization I created. Any suggestion here is appreciated.

Beside updating the module, I had to change 2 lines of code due to this breaking change google/go-github#2646

/cc @kfcampbell

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Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Added the appropriate label for the given change

Does this introduce a breaking change?

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• Yes (Please add the Type: Breaking change label)
• No

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• Bugfix: Type: Bug
• Feature/model/API additions: Type: Feature
• Updates to docs or samples: Type: Documentation
• Dependencies/code cleanup: Type: Maintenance

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[kfcampbell]

Thanks for doing this!