Fix for reimplemented-operator (FURB118) should be marked unsafe

[dscorbett]

The fix for reimplemented-operator (FURB118) should be marked unsafe because the code could rely on the parameter names. Compare unnecessary-lambda (PLW0108), whose fix is already marked unsafe for that reason. There are some cases where it can be proved that the function is never called with keyword arguments so the fix is safe, but in general that is not possible.

$ ruff --version
ruff 0.6.6
$ cat furb118.py
add = lambda x, y: x + y
print(add(x=1, y=2))
$ python furb118.py
3
$ ruff check --isolated --preview --select FURB118 furb118.py --fix
Found 1 error (1 fixed, 0 remaining).
$ python furb118.py 2>&1 | tail -n 3
    print(add(x=1, y=2))
          ^^^^^^^^^^^^^
TypeError: _operator.add() takes no keyword arguments