Make typing_extensions a hard dependency

[maresb]

It's used in

mypy_boto3_builder/mypy_boto3_builder/utils/type_checks.py

Line 5 in 672ab31

from typing_extensions import TypeIs

I updated conda-forge/mypy_boto3_builder-feedstock#132 to reflect the dependencies here, and now it's failing.

Notes

Please describe your changes here.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

All of these are optional:

• I have performed a self-review of my own code
• I have run ./scripts/before_commit.sh to follow the style guidelines of this project
• I have tested my code changes

Thank you!

[vemel]

Hello!

Thank you for your contribution. I gladly accept it. I think for now I can use TypeGuard instead of TypeIs until the project is migrated to 3.13.