Update dependency NUnit to 4.6.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
NUnit (source)	4.5.0 → 4.6.1

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Release Notes

nunit/nunit (NUnit)

v4.6.1: NUnit version 4.6.1

See release notes for details.

v4.6.0: NUnit 4.6.0

Compare Source

See release notes for details.

v4.5.1: V 4.5.1

Compare Source

See release notes for details.

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Reviewing files that changed from the base of the PR and between 531cd59 and e4435b9.

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• src/Cassandra.Tests/Cassandra.Tests.csproj

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