Make sure all deprecated items in importlib raise `DeprecationWarning`

- [x] [`importlib.abc.Loader`](https://docs.python.org/3/library/importlib.html#importlib.abc.Loader.load_module)
  - [x] [`importlib.abc.InspectLoader.load_module()`](https://docs.python.org/3/library/importlib.html#importlib.abc.InspectLoader.load_module)
  - [x] [`importlib.abc.FileLoader.load_module()`](https://docs.python.org/3/library/importlib.html#importlib.abc.FileLoader.load_module)
  - [x] [`importlib.abc.SourceLoader.load_module()`](https://docs.python.org/3/library/importlib.html#importlib.abc.SourceLoader.load_module)
  - [x] [`importlib.machinery.SourceFileLoader.load_module()`](https://docs.python.org/3/library/importlib.html#importlib.machinery.SourceFileLoader.load_module)
  - [x] [`imortlib.machinery.SourcelessFileLoader.load_module()`](https://docs.python.org/3/library/importlib.html#importlib.machinery.SourcelessFileLoader.load_module)
- [x] [`importlib.abc.ResourceLoader`](https://docs.python.org/3/library/importlib.html#importlib.abc.ResourceLoader)
- [x] [`importlib.abc.SourceLoader.path_mtime()`](https://docs.python.org/3/library/importlib.html#importlib.abc.SourceLoader.path_mtime)
- [x] [`importlib.machinery.DEBUG_BYTECODE_SUFFIXES`](https://docs.python.org/3/library/importlib.html#importlib.machinery.DEBUG_BYTECODE_SUFFIXES)
- [x] [`importlib.machinery.OPTIMIZED_BYTECODE_SUFFIXES`](https://docs.python.org/3/library/importlib.html#importlib.machinery.OPTIMIZED_BYTECODE_SUFFIXES)
- [x] `debug_override` parameter of [`importlib.util.cache_from_source()`](https://docs.python.org/3/library/importlib.html#importlib.util.cache_from_source)


### Linked PRs
* gh-121765
* gh-128007
* gh-128859
* gh-128904

Nov	DEC	Jan
	11
2024	2025	2026

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Make sure all deprecated items in importlib raise `DeprecationWarning` #121604

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Make sure all deprecated items in importlib raise DeprecationWarning #121604

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Make sure all deprecated items in importlib raise `DeprecationWarning` #121604