Update dependency NUnit3TestAdapter to 6.1.0

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
NUnit3TestAdapter (source)	nuget	minor	6.0.1 → 6.1.0

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[Copilot]

Pull request overview

This PR updates the NUnit3TestAdapter package from version 6.0.1 to 6.1.0 across all test projects in the repository. This is a minor version update that maintains consistency across all test project dependencies.

Key Changes:

• NUnit3TestAdapter dependency updated from 6.0.1 to 6.1.0 in all three test projects

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
TomLonghurst.ReadableTimeSpan.UnitTests/TomLonghurst.ReadableTimeSpan.UnitTests.csproj	Updated NUnit3TestAdapter version to 6.1.0
TomLonghurst.ReadableTimeSpan.System.Text.Json.UnitTests/TomLonghurst.ReadableTimeSpan.System.Text.Json.UnitTests.csproj	Updated NUnit3TestAdapter version to 6.1.0
TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests/TomLonghurst.ReadableTimeSpan.Newtonsoft.Json.UnitTests.csproj	Updated NUnit3TestAdapter version to 6.1.0

The changes are consistent, properly formatted, and represent a straightforward dependency update. No issues were identified with the implementation.

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