[configparser] Add several deprecated attributes

[donbarbos]

• Source: gh-89336: Remove configparser APIs that were deprecated for 3.12 cpython#92503
• Deprecate SafeConfigParser
• Deprecate ParsingError filename parameter
• Add deprecated ParsingError methods
• Deprecate RawConfigParser.readfp method

[brianschubert]

The same PR also removed a deprecated parameter from ParsingError, which isn't reflected in the stubs yet. Might as well add that as well while we're here!

[donbarbos]

The same PR also removed a deprecated parameter from ParsingError, which isn't reflected in the stubs yet. Might as well add that as well while we're here!

Thanks, again it seems to me that it is worth adding some removed deprecated methods since they reflected some capabilities of ParsingError (as in #14457 :-), but I'll be glad if someone agrees that they should be added:

    if sys.version_info < (3, 12):
        @property
        @deprecated("Removed in Python 3.12. Use `source` instead.")
        def filename(self) -> str: ...
        @filename.setter
        @deprecated("Removed in Python 3.12. Use `source` instead.")
        def filename(self, value: str) -> None: ...
        @deprecated("Removed in Python 3.12. Use `parser.read_file()` instead.")
        def readfp(self, fp: Iterable[str], filename: str | None = None) -> None: ...

[brianschubert]

Looks like they were documented APIs, so adding them sounds reasonable to me

[donbarbos]

Looks like they were documented APIs, so adding them sounds reasonable to me

Indeed, I didn't notice that they were documented

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉