fix: Resolved an issue where TypeAliases in typings module were invalid for Python versions >= 3.14

[Moortiii]

In order to preserve support for Python versions below 3.12 we use TypeAlias over the newly supported type.

---

Note

Updates type definitions for compatibility and clarity.

• Refactors Json, Jsons, RequestHeaders, ResponseHeaders, Params, and Formatter to use typing.TypeAlias
• Moves alias descriptions to standalone docstrings; removes __doc__ assignments
• No functional or runtime changes

^{Written by Cursor Bugbot for commit a9d0af8. This will update automatically on new commits. Configure here.}

[apetenchea]

Thanks!