Bump NUnit3TestAdapter from 4.3.0 to 4.3.1 in /UnitTests (#253)

Bumps [NUnit3TestAdapter](https://github.com/nunit/nunit3-vs-adapter) from 4.3.0 to 4.3.1.
- [Release notes](https://github.com/nunit/nunit3-vs-adapter/releases)
- [Commits](nunit/nunit3-vs-adapter@V4.3.0...V4.3.1)

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

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Author: dependabot[bot]

UnitTests/UnitTests.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="nunit" Version="3.13.3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.3.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.3.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
   </ItemGroup>
   <ItemGroup>