Updates oneshot type of psutil.Process

[sobolevn]

Docs: https://psutil.readthedocs.io/en/latest/index.html?highlight=oneshot#psutil.Process.oneshot
Source: https://github.com/giampaolo/psutil/blob/dccf8bedf34fced63f1962dd77b58f0da339759c/psutil/__init__.py#L472
Original question: python/typing#885

[sobolevn]

Tests are failing for the sphinx package:

 error: deprecated.sphinx.deprecated is inconsistent, stub does not have argument "line_length"
Stub: at line 26
Overload(def [_F <: def (*Any, **Any) -> Any] (_F`-1) -> _F`-1, def (reason: builtins.str =, *, version: builtins.str =, action: Union[Union[Literal['default'], Literal['error'], Literal['ignore'], Literal['always'], Literal['module'], Literal['once']], None] =, category: Union[Type[builtins.Warning], None] =) -> def [_F <: def (*Any, **Any) -> Any] (_F`-1) -> _F`-1)
Inferred signature: def (__wrapped: _F`-1 = ..., reason: builtins.str = ..., *, action: Union[Literal['default'], Literal['error'], Literal['ignore'], Literal['always'], Literal['module'], Literal['once'], None] = ..., category: Union[Type[builtins.Warning], None] = ..., version: builtins.str = ...)
Runtime: at line 218 in file /tmp/tmply4auol1/lib/python3.9/site-packages/deprecated/sphinx.py
def (reason='', version='', line_length=70, **kwargs)

stubtest failed for Deprecated

I can fix them in the next PR.

[srittau]

Please ignore the deprecated failures, see #6005 for a fix.