ruff

97e6fc37 - [red-knot] Unpacking and for loop assignments to attributes (#16004)

[red-knot] Unpacking and for loop assignments to attributes (#16004) ## Summary * Support assignments to attributes in more cases: - assignments in `for` loops - in unpacking assignments * Add test for multi-target assignments * Add tests for all other possible assignments to attributes that could possibly occur (in decreasing order of likeliness): - augmented attribute assignments - attribute assignments in `with` statements - attribute assignments in comprehensions - Note: assignments to attributes in named expressions are not syntactically allowed closes #15962 ## Test Plan New Markdown tests