chore(deps): update dependency astroid to v2.15.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
astroid	==2.15.6 -> ==2.15.8

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Release Notes

pylint-dev/astroid (astroid)

v2.15.8

Compare Source

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Release date: 2023-09-26

• Fix a regression in 2.15.7 for unsubscriptable-object.

  Closes #​2305
  Closes pylint-dev/pylint#9069

• Fix a regression in 2.15.7 for unsubscriptable-object.

  Closes #​2305
  Closes pylint-dev/pylint#9069

v2.15.7

Compare Source

=============================
Release date: 2023-09-23

• Fix a crash when inferring a typing.TypeVar call.

  Closes pylint-dev/pylint#8802

• Infer user-defined enum classes by checking if the class is a subtype of enum.Enum.

  Closes pylint-dev/pylint#8897

• Fix inference of functions with @functools.lru_cache decorators without
  parentheses.

  Closes pylint-dev/pylint#8868

• Make sys.argv uninferable because it never is. (It's impossible to infer
  the value it will have outside of static analysis where it's our own value.)

  Refs pylint-dev/pylint#7710

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