Allows use of typing_extensions.Annotated when python version is less than 3.9

[jdoiro3]

Currently, the use of typing_extensions.Annotated doesn't work. This PR adds support for the type when the version of Python is less that 3.9 (i.e., the user can't use typing.Annotated).

[Tinche]

Cool! Can you add a changelog entry too? And maybe a line to the Annotated sections in the docs?

[jdoiro3]

Cool! Can you add a changelog entry too? And maybe a line to the Annotated sections in the docs?

@Tinche, I just added an entry under the current unreleased version. Let me know if any other changes are needed.

[codecov-commenter]

Codecov Report

Merging #366 (cf97e3c) into main (dfa901e) will decrease coverage by 11.18%.
The diff coverage is 100.00%.

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@@             Coverage Diff             @@
##             main     #366       +/-   ##
===========================================
- Coverage   95.88%   84.71%   -11.18%     
===========================================
  Files          26       26               
  Lines        2139     2139               
===========================================
- Hits         2051     1812      -239     
- Misses         88      327      +239     

Impacted Files	Coverage Δ
src/cattrs/_compat.py	57.20% <100.00%> (-38.85%)	⬇️

... and 8 files with indirect coverage changes

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[Tinche]

Please rebase and let's get this merged in.

[jdoiro3]

@Tinche, not sure why CI isn't running but this looks good to go.

[Tinche]

I reran the action, looks like there's a linting issue now.

[jdoiro3]

@Tinche, can you run CI again? I removed the get_origin import from typing_extensions since it seems to be the same implementation as typing. Wasn't sure it was. I need to confirm that function is part of pyhton 3.7 and 3.8. It was introduced in 3.8 so need to revert.

[jdoiro3]

Looks like everything passes except pre-commit.ci.

[Tinche]

Sweet. I don't actually know where the pre-commit.ci is defined. Maybe the python-attrs organization?