Update dependency NUnit to v5

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
NUnit (source)	nuget	major	4.6.1 → 5.0.0

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Release Notes

nunit/nunit (NUnit)

v5.0.0: Version 5.0.0

See release notes for details.

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-27T15:18:38.944322Z	7d0bd3d	PR opened

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• TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests/TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests.csproj
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• TomLonghurst.ReadableTimeSpan.UnitTests/TomLonghurst.ReadableTimeSpan.UnitTests.csproj

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