Patch all module attributes in its namespace

[albertvillanova]

When patching module attributes, only those defined in its __all__ variable were considered by default (only falling back to __dict__ if __all__ was None).

However those are only a subset of all the module attributes in its namespace (__dict__ variable).

This PR fixes the problem of modules that have non-None __all__ variable, but try to access an attribute present in __dict__ (and not in __all__).

For example, pandas has attribute __version__ only present in __dict__.

• Before version 1.4, pandas __all__ was None, thus all attributes in __dict__ were patched
• From version 1.4, pandas __all__ is not None, thus attributes in __dict__ not present in __all__ are ignored

Fix #3724.

CC: @severo @lvwerra

[lhoestq]

good catch !