Bump NUnit from 3.14.0 to 4.2.2

Bumps [NUnit](https://github.com/nunit/nunit) from 3.14.0 to 4.2.2.
- [Release notes](https://github.com/nunit/nunit/releases)
- [Changelog](https://github.com/nunit/nunit/blob/main/CHANGES.md)
- [Commits](nunit/nunit@v3.14.0...4.2.2)

---
updated-dependencies:
- dependency-name: NUnit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

src/Directory.Build.props

@@ -22,7 +22,7 @@
   <PropertyGroup>
     <AkkaTestKitVersion>1.5.28</AkkaTestKitVersion>
     <MicrosoftNetTestSdkVersion>17.11.1</MicrosoftNetTestSdkVersion>
-    <NUnit3Version>3.14.0</NUnit3Version>
+    <NUnit3Version>4.2.2</NUnit3Version>
     <NUnit4Version>4.2.2</NUnit4Version>
     <NUnitAnalyzersVersion>4.3.0</NUnitAnalyzersVersion>
     <NUnitTestAdapterVersion>4.6.0</NUnitTestAdapterVersion>