Remove stubs for Babel (not until August 2023)

[DenverCoder1]

Babel has just incorporated typeshed's stubs as inline annotations and added a py.typed file (see python-babel/babel#934). These changes were released in v2.12.0 on Feb 28, 2023.

[AlexWaygood]

The 6-month clock starts once a release with a py.typed file is published to PyPI, so we'll need to wait until a release is published that has python-babel/babel#975 in it :)

[akx]

2.12.1 is out now :)

Sorry for the mess!

[AlexWaygood]

@akx thanks so much for the hotfix release!