[3.14] Raise DeprecationWarnings (GH-121604)

[rashansmith]

This fixes #121604.

• 
 importlib.abc.ResourceLoader
• 
 importlib.abc.SourceLoader.path_mtime()
• 
 importlib.machinery.DEBUG_BYTECODE_SUFFIXES
• 
 importlib.machinery.OPTIMIZED_BYTECODE_SUFFIXES
• 
 importlib.machinery.WindowsRegistryFinder
• importlib.machinery.SourcelessFileLoader

The others defined in the issue can be considered already done.

Issue: https://github.com/python/cpython/issues/121604

• Issue: gh-121604

[ghost]

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[rashansmith]

@tomasr8 thanks for the review, I made some changes.

[brettcannon]

FYI this PR breaks the test suite, so CI isn't passing.

[tomasr8]

Hi @rashansmith! Looks like this PR hasn't had any activity in a while, would you like to continue working on it?

[StanFromIreland]

Hello @rashansmith if you do not have the time to complete this I can take on the project.

[tomasr8]

Hello @rashansmith if you do not have the time to complete this I can take on the project.

Hey! Thanks for volunteering @StanFromIreland, but I'm already working on finishing this PR :/ If you still want to help with this though, I'd appreciate your review! I'll send the updated PR tomorrow :slightly_smiling_face:

[tungol]

This MR is currently adding deprecation warnings to importlib.abc.Loader, importlib.machinery.SourcelessFileLoader, and importlib.abc.InspectLoader, but none of those are currently documented as being deprecated; just the load_module method for each.

[rashansmith]

Hello everyone, thanks for taking this on. It was my first attempt at a PR in this repo so I'm looking forward to seeing how the work here is done and hopefully I can contribute to more work in the future!

[tomasr8]

Thanks @rashansmith for your work! I'm giving you credit in the followup PR :)

I'll close this now since it's superseded by https://github.com/python/cpython/pull/128007