Remove unused max-line-length argument in flake8

It doesn't matter because we are ignoring E501

Remove unused max-line-length argument in flake8
bc878138 · Ricardo Vieira · Ricardo Vieira · fc0d9ec2 · bc878138
--- a/setup.cfg
+++ b/setup.cfg
 [flake8]
 select = C,E,F,W
 ignore = E203,E231,E501,E741,W503,W504,C901
-max-line-length = 88
 per-file-ignores =
    **/__init__.py:F401,E402,F403
    pytensor/tensor/linalg.py:F401,F403