pybind/mgr: fix tox autopep8 args flake8

[aaSharma14]

Similar to mypy, we now need a backslash to signal a newline doesn't mean to start a new command

Follow up of: #49361

Signed-off-by: Aashish Sharma aasharma@redhat.com

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[tchaikov]

in future, I'd suggest backport changes from main instead replicating them. If we have to, please note the reason why the change cannot be backported in the commit message.