2.6.0 Has incorrect `typing-extensions` dependency

This PR: https://github.com/PyGithub/PyGithub/pull/3111
in 2.6.0 includes
```
from typing_extensions import deprecated
```

The pyproject.toml file has: https://github.com/PyGithub/PyGithub/blob/main/pyproject.toml#L34
```
  "typing-extensions>=4.0.0",
```

However, `deprecated` is not present in typing-extensions 4.0.0, but requires a newer version.