Sækja Python 3.8 3.8.3

Core and Builtins
- bpo-40527: Fix command line argument parsing: no longer write errors multiple times into stderr.
- bpo-40417: Fix imp module deprecation warning when PyImport_ReloadModule is called. Patch by Robert Rouhani.
- bpo-39562: The constant values of future flags in the __future__ module are updated in order to prevent collision with compiler flags. Previously PyCF_ALLOW_TOP_LEVEL_AWAIT was clashing with CO_FUTURE_DIVISION.
Library
- bpo-40559: Fix possible memory leak in the C implementation of asyncio.Task.
- bpo-40355: Improve error reporting in ast.literal_eval() in the presence of malformed ast.Dict nodes instead of silently ignoring any non-conforming elements. Patch by Curtis Bucher.
- bpo-40459: platform.win32_ver() now produces correct ptype strings instead of empty strings.
- bpo-40398: typing.get_args() now always returns an empty tuple for special generic aliases.
Documentation
- bpo-40561: Provide docstrings for webbrowser open functions.
- bpo-39435: Fix an incorrect signature for pickle.loads() in the docs
Windows
- bpo-40458: Increase reserved stack space to prevent overflow crash on Windows.
C API
- bpo-40412: Nullify inittab_copy during finalization, preventing future interpreter initializations in an embedded situation from crashing. Patch by Gregory Szorc.