Update Pester to 6.0.0

[nohwnd]

Pester 6.0.0 is now released 🎉 — thanks for letting me pilot the release candidates against your suite.

This updates the earlier release-candidate pin to the final 6.0.0 and keeps the test changes needed to run on Pester 6 (already in this PR). It's the same migration you'd make yourself, so you're welcome to merge it, cherry-pick just the compatibility changes, or use it purely as a reference.

Your unit tests pass on 6.0.0 (WS2022 + WS2025). The remaining red HQRM check is this repo's own quality gates (a CHANGELOG-in-diff check + PSScriptAnalyzer rules), unrelated to Pester.

The real-world CI signal from this pilot was genuinely valuable in getting 6.0.0 right. Thanks for the CI time this used, and for maintaining a suite I could test against.

This PR was co-authored by GitHub Copilot.

— Jakub & Copilot

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Reviewing files that changed from the base of the PR and between 6570592 and d825c5b.

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• RequiredModules.psd1

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