B024 false negative when there's a class var

[aureliojargas]

from abc import ABC


class Foo(ABC):
    BAR = 1

    def method(self):
        bar()

Because of the BAR = 1 declaration, B024 is considering Foo an ABC, but it isn't.

Expected:

$ flake8 --isolated --select B024 abc.py
abc.py:4:1: B024 Foo is an abstract base class, but none of the methods it defines are abstract. This is not necessarily an error, but you might have forgotten to add the @abstractmethod decorator, potentially in conjunction with @classmethod, @property and/or @staticmethod.
$

But got:

$ flake8 --isolated --select B024 abc.py
$

Info:

$ flake8 --version
7.0.0 (flake8-bugbear: 24.4.26, mccabe: 0.7.0, pycodestyle: 2.11.1, pyflakes: 3.2.0) CPython 3.12.2 on Darwin

This looks related to the fix for #293.

If I comment out this code, it works as expected:

flake8-bugbear/bugbear.py

Lines 925 to 929 in d1aec4c

	# https://github.com/PyCQA/flake8-bugbear/issues/293
	# Ignore abc's that declares a class attribute that must be set
	if isinstance(stmt, (ast.AnnAssign, ast.Assign)):
	has_abstract_method = True
	continue

By the way, this same issue was reported to ruff in astral-sh/ruff#11208 and they got a fix. Maybe here a similar patch would work?