Use PyDict_GetItemRef()

[serhiy-storchaka]

The following PR makes the code, that currently uses PyDict_GetItemWithError() which returns a borrowing reference and then call Py_INCREF() on the result to make a strong reference, to use PyDict_GetItemRef().

cc @vstinner

Linked PRs

• gh-111789: Use PyDict_GetItemRef() #111790
• gh-111789: Use PyDict_GetItemRef() in Objects/ #111827
• gh-111789: Use PyDict_GetItemRef() in _ctypes #111828
• gh-111789: Use PyDict_GetItemRef() in sqlite #111829
• gh-111789: Simplify bytecodes.c by using PyDict_GetItemRef() #111978
• gh-111789: Simplify import.c by using PyDict_GetItemRef() #111979
• gh-111789: Simplify ceval.c by using PyDict_GetItemRef() #111980
• gh-111789: Use PyDict_GetItemRef() in Modules/_asynciomodule.c #112072
• gh-111789: Use PyDict_GetItemRef() in Modules/_csv.c #112073
• gh-111789: Use PyDict_GetItemRef() in Modules/_elementtree.c #112074
• gh-111789: Use PyDict_GetItemRef() in Modules/_struct.c #112076
• gh-111789: Use PyDict_GetItemRef() in Modules/_threadmodule.c #112077
• gh-111789: Use PyDict_GetItemRef() in Modules/_zoneinfo.c #112078
• gh-111789: Use PyDict_GetItemRef() in Modules/pyexpat.c #112079
• gh-111789: Use PyDict_GetItemRef() in Python/_warnings.c #112080
• gh-111789: Use PyDict_GetItemRef() in Python/bltinmodule.c #112081
• gh-111789: Use PyDict_GetItemRef() in Python/codecs.c #112082
• gh-111789: Use PyDict_GetItemRef() in Python/compile.c #112083
• gh-111789: Use PyDict_GetItemRef() in Python/symtable.c #112084

[gvanrossum]

It would perhaps be easier to review if there was one PR per file touched. That way the expert for a given file can approve (or even merge) without having to say something like "okay for foobar.c" and the PR author won't have to keep track of which files are approved.