Fixing imports in type-stubs for Pyright

[Mikaël Capelle]

In many PyQt6 stubs file, abstract collections from `collections.abc` are
used, but the import is `collections` which breaks pyright (see
https://github.com/microsoft/pyright/issues/5241), which is one of the most
commonly used type checker.

An easy fix would to import `collections.abc` instead of simply
`collections` (or both if both are needed) in the stubs file.

Holt59
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