gh-104683: Argument clinic: use dict over OrderedDict

[AlexWaygood]

Instances of builtins.dict have been ordered since 3.6, and have been guaranteed by the language to be ordered since Python 3.7. Since Argument Clinic requires Python 3.10+, we can replace usages of OrderedDict with dict. This is less verbose, more readable, and might be slightly more performant. (OrderedDicts have a few features that dicts don't have, but we don't use any of those features in Argument Clinic.)

• Issue: Modernise code in Tools/clinic/ #104683

[erlend-aasland]

That's a nice readability improvement. Is collections still used? If not, lets remove the import also.

Also, I think we should stick to the established workflow regarding skip issue; all refactorings require an issue.

[AlexWaygood]

Is collections still used? If not, lets remove the import also.

Yes, still used for deque and Counter :)

Also, I think we should stick to the established workflow regarding skip issue; all refactorings require an issue (unless things have changed recently).

Sure, I'll create an issue