Only use typing-extensions if necessary

[ppentchev]

As discussed in #562 - a second PR that contains the change that makes the use of typing-extensions conditional on the Python version.

Thanks for your work on libtmux and tmuxp!

Summary by Sourcery

Enhancements:

• Import typing.Self if Python version is greater than or equal to 3.11, otherwise import it from typing_extensions.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request refactors the import logic for type annotations so that the usage of typing-extensions is conditional based on the Python version. The changes conditionally import Self and TypeAlias from either typing or typing-extensions depending on the Python version, reducing unnecessary dependencies when running on newer Python versions.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Conditional import of Self in the test module	Removed the unconditional import of Self from typing-extensions Added conditional logic to import Self from typing when Python version is 3.11 or higher, otherwise importing from typing-extensions	src/libtmux/test.py
Conditional import of TypeAlias in the server module	Removed the direct import of TypeAlias from typing-extensions in the type checking block Introduced conditional logic to import TypeAlias from typing for Python versions 3.10 and above, otherwise falling back to typing-extensions	src/libtmux/server.py
Conditional import of TypeAlias in test files for the legacy API and version tests	Removed the direct import of TypeAlias from typing-extensions in the type checking blocks Added conditional statements to import TypeAlias from typing if the Python version is 3.10 or higher, otherwise importing from typing-extensions	tests/legacy_api/test_version.py tests/test_version.py

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[sourcery-ai]

Hey @ppentchev - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a comment explaining why the version check is different for Self and TypeAlias.
• It might be cleaner to define a helper function to handle the conditional import of Self and TypeAlias.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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