Bump NUnit3TestAdapter from 4.2.1 to 4.3.1 (#73)

Bumps [NUnit3TestAdapter](https://github.com/nunit/nunit3-vs-adapter) from 4.2.1 to 4.3.1.
- [Release notes](https://github.com/nunit/nunit3-vs-adapter/releases)
- [Commits](nunit/nunit3-vs-adapter@V4.2.1...V4.3.1)

---
updated-dependencies:
- dependency-name: NUnit3TestAdapter
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/Directory.Build.props

@@ -17,7 +17,7 @@
 	</PropertyGroup>
 	<PropertyGroup>
 		<NUnitVersion>3.13.3</NUnitVersion>
-		<NUnitAdapterVersion>4.2.1</NUnitAdapterVersion>
+		<NUnitAdapterVersion>4.3.1</NUnitAdapterVersion>
 		<AkkaTestKitVersion>1.4.46</AkkaTestKitVersion>
 	</PropertyGroup>
 </Project>