Bump NSubstitute from 4.2.2 to 4.3.0

Bumps NSubstitute from 4.2.2 to 4.3.0.

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

Signed-off-by: dependabot[bot] <support@github.com>

test/test.xunit.runner.visualstudio/test.xunit.runner.visualstudio.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="NSubstitute" Version="4.2.2" />
+    <PackageReference Include="NSubstitute" Version="4.3.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.reporters" Version="2.4.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />