Use XDG_CACHE_HOME for PYLINTHOME

[e-kwsm]

Steps

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  doc/whatsnew/<current release.rst>.
• Write a good description on what the PR does.

Description

On Linux, analysis date are stored under ~/.pylint.d at the moment, which is not compliant with XDG Base Directory Specification.

As @blueyed commented, I believe pickle files should be located under $XDG_CACHE_HOME rather than $XDG_DATA_HOME.

Closes #3878.

Type of Changes

	Type
✓	✨ New feature
✓	🔨 Refactoring
✓	📜 Docs

Related Issue

[coveralls]

Coverage increased (+0.02%) to 92.178% when pulling 8c61b24 on e-kwsm:XDG_CACHE_HOME into a054796 on PyCQA:main.

[Pierre-Sassoulas]

Looks good, thank you for implementing this change ! I think there is no breaking changes and it can go in 2.10.0 (ie: we'll merge only when all 2.9.x crashes have been fixed).

[Pierre-Sassoulas]

Perfect, thanks a lot ! I'm going to merge as soon as we release the last expected 2.9.x

[Pierre-Sassoulas]

Thank you again for this, it will be available in 2.10.0 :)

[MestreLion]

This seems to also (truly) close #1364

[CAM-Gerlach]

FYI, appdirs is effectively unmaintained; platformdirs is the community's forked replacement. Black has already switched, and given this dep was newly added, it would make sense to use the modern, maintained replacement now given its drop-in compatible and fixes numerous long-outstanding bugs with the original, instead of having to switch later if and when things eventually break.

[Pierre-Sassoulas]

Thanks @CAM-Gerlach I created #4886 for this.