Update Typeinfo for extensions in Response class

[KalleDK]

To remove the unknown dict type info

(variable) extensions: ResponseExtensions | dict[Unknown, Unknown]

Summary

Simple add typing information for the extensions variable, as the default dict is "unknown"

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[tomchristie]

I don't have a problem with merging this, since yep the typing here is correct.

(variable) extensions: ResponseExtensions | dict[Unknown, Unknown]

What tooling are you using that's showing you this type error? (We don't have a mypy issue here in our CI)

[KalleDK]

I don't have a problem with merging this, since yep the typing here is correct.

(variable) extensions: ResponseExtensions | dict[Unknown, Unknown]

What tooling are you using that's showing you this type error? (We don't have a mypy issue here in our CI)

Pylance (Pyright) with strict mode. They really don't like empty dicts/lists without typeinfo

[KalleDK]

And thanks for merging it - one squiggly line less and one type ignore less for me :)