Fix failing Python test

[claremacrae]

I looked at approving some PRs this evening, and see that one of the tests of python scripts has started failing:
https://github.com/obsidian-community/obsidian-hub/actions/runs/3448377582

I've had a quick look at the code and nothing has changed recently, so I assume it's a change in version of a tool that is being used... and pulled in via the GitHub Actions infrastructure.

The code is the second of these 2 lines:

https://github.com/obsidian-community/obsidian-hub/blob/2ab98067db49131355619e5a24e6bda3021682c9/.github/scripts/update_issues.py#L21:L22

class GithubClient:
    def get(self, url: str, _get: str) -> List[Any]: ...

[claremacrae]

The failure in a function declared as ... appears to come from changed discussed in:
python/mypy#2350

and implemented in:
python/mypy#13729

[claremacrae]

Suggested fix is here:
python/mypy#14048 (comment)