E402: Add "with" to allowed_try_keywords

[EricCousineau-TRI]

For certain imports, it would be nice to scope warning filters (e.g. in RobotLocomotion/drake#10527).

In my case, I want to do something like:

import warnings

with warnings.catch_warnings():
    warnings.filterwarnings(
        "ignore", category=ImportWarning,
        message="can't resolve package from __spec__")
    import meshcat

Without mods to 2.3.1, it throws a warning about this. If I add "with" to the allowed keywords, then it works.

Would it be possible to add this keyword?