[com1;com4;com8;com9] Removed Windows-OS-specific conditional imports for multiprocessing

[fso42]

Reported by @stnfranck

On Windows recent python versions don't need the distinction for parallel threads anymore. This lead to having multiple processes but only on one core.

It runs on multiple cores now...

[qltysh]

Coverage Impact

⬆️ Merging this pull request will increase total coverage on master by 0.03%.

Modified Components (1)

Rating	Component	% Diff
	com1DFA	100.0%

Modified Files with Diff Coverage (4)

Rating	File	% Diff	Uncovered Line #s
	avaframe/com4FlowPy/flowCore.py	100.0%
	avaframe/com1DFA/com1DFA.py	100.0%
	avaframe/com8MoTPSA/com8MoTPSA.py	0.0%	12
	avaframe/com9MoTVoellmy/com9MoTVoellmy.py	100.0%
	Total	75.0%

🤖 Increase coverage with AI coding...

In the `removeWinParallelDifference` branch, add test coverage for this new code:

- `avaframe/com8MoTPSA/com8MoTPSA.py` -- Line 12

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• Diff Coverage: Coverage for added or modified lines of code (excludes deleted files). Learn more.

• Total Coverage: Coverage for the whole repository, calculated as the sum of all File Coverage. Learn more.

• File Coverage: Covered Lines divided by Covered Lines plus Missed Lines. (Excludes non-executable lines including blank lines and comments.)

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[fso42]

Standardtest ident