Upgrade astroid to 2.15.8 on 2.17.x branch

[jacobtylerwalls]

Backport of #9071.

[jacobtylerwalls]

@mbyrnepr2 Do you mind taking over and fixing the 3.7 test? 🙏

[mbyrnepr2]

Happy to do that @jacobtylerwalls and thanks for doing all this work related to issues of mine recently!
Is it necessary to backport tests like this? Our main branch CI doesn't run tests for Python 3.7 anymore since it is end of life so does it make sense to update the tests to handle the no-member (in the currently failing CI for this PR)?

[jacobtylerwalls]

Good point, no, not necessarily, unless the test reveals a real incompatibility with the stuff we're about to backport. Sounds like no (i.e. just an issue with the test having slightly different output?)

[Pierre-Sassoulas]

I think it's ok to more or less silently "drop support for python 3.7" (i.e. simply removing the tests and changing packaging metadata, not actually doing what we did on main) in the latest 2.17.x. Especially if we still support 2.17.x it at the same time than 3.0.x maintenance branch following 3.0.0 release.

[jacobtylerwalls]

Alright, let's just merge the astroid upgrade, and do a pylint patch release.

Especially if we still support 2.17.x it at the same time than 3.0.x maintenance branch following 3.0.0 release.

-1 on merging anything else to the 2.17.x maintenance branch ever again, honestly.

[codecov]

Codecov Report

Merging #9081 (4b3d009) into maintenance/2.17.x (aed51a6) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           maintenance/2.17.x    #9081   +/-   ##
===================================================
  Coverage               95.57%   95.57%           
===================================================
  Files                     178      178           
  Lines                   18869    18869           
===================================================
  Hits                    18034    18034           
  Misses                    835      835           

[Pierre-Sassoulas]

Nevermind :)