Weird __slots__ manip causes pylint to crash

[DeveloperAnonymous]

Bug description

When parsing the following a.py:

class Test:
    __slots__ = ["a", "b", "c"]

class TestChild(Test):
    __slots__ += ["d", "e", "f"]

t = TestChild()

print(t.__slots__)

Command used

pylint a.py

Pylint output

pylint crashed with a ``AstroidError`` and with the following stacktrace:

Traceback (most recent call last):
  File "c:\Users\Matth\.vscode\extensions\ms-python.pylint-2023.10.1\bundled\libs\pylint\lint\pylinter.py", line 788, in _lint_file
    check_astroid_module(module)
  File "c:\Users\Matth\.vscode\extensions\ms-python.pylint-2023.10.1\bundled\libs\pylint\lint\pylinter.py", line 1017, in check_astroid_module
    retval = self._check_astroid_module(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "c:\Users\Matth\.vscode\extensions\ms-python.pylint-2023.10.1\bundled\libs\pylint\lint\pylinter.py", line 1069, in _check_astroid_module
    walker.walk(node)
  File "c:\Users\Matth\.vscode\extensions\ms-python.pylint-2023.10.1\bundled\libs\pylint\utils\ast_walker.py", line 94, in walk
    self.walk(child)
  File "c:\Users\Matth\.vscode\extensions\ms-python.pylint-2023.10.1\bundled\libs\pylint\utils\ast_walker.py", line 91, in walk
    callback(astroid)
  File "c:\Users\Matth\.vscode\extensions\ms-python.pylint-2023.10.1\bundled\libs\pylint\checkers\classes\class_checker.py", line 879, in visit_classdef
    self._check_slots(node)
  File "c:\Users\Matth\.vscode\extensions\ms-python.pylint-2023.10.1\bundled\libs\pylint\checkers\classes\class_checker.py", line 1492, in _check_slots
    for slots in node.ilookup("__slots__"):
  File "c:\Users\Matth\.vscode\extensions\ms-python.pylint-2023.10.1\bundled\libs\astroid\bases.py", line 194, in _infer_stmts
    raise InferenceError(
astroid.exceptions.InferenceError: Inference failed for all members of [<AssignName.__slots__ l.5 at 0x14ef5196a20>].

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "c:\Users\Matth\.vscode\extensions\ms-python.pylint-2023.10.1\bundled\libs\pylint\lint\pylinter.py", line 752, in _lint_files
    self._lint_file(fileitem, module, check_astroid_module)
  File "c:\Users\Matth\.vscode\extensions\ms-python.pylint-2023.10.1\bundled\libs\pylint\lint\pylinter.py", line 790, in _lint_file
    raise astroid.AstroidError from e
astroid.exceptions.AstroidError

Expected behavior

No crash.

Pylint version

pylint 3.0.2
astroid 3.0.1
Python 3.12.1 (tags/v3.12.1:2305ca5, Dec  7 2023, 22:03:25) [MSC v.1937 64 bit (AMD64)]

OS / Environment

win32 (Windows)