Update dependency NUnit3TestAdapter to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
NUnit3TestAdapter (source)	5.2.0 → 6.2.0

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Release Notes

nunit/nunit3-vs-adapter (NUnit3TestAdapter)

v6.2.0: V 6.2.0

See release notes

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Reviewing files that changed from the base of the PR and between 531cd59 and 73c6003.

📒 Files selected for processing (2)

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

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