Merge pull request #750 from WildGums/dependabot/nuget/src/NUnit-4.3.1

Bump NUnit from 4.3.0 to 4.3.1 in /src

Author: github-actions[bot]

src/Orc.Plot.Tests/Orc.Plot.Tests.csproj

@@ -21,7 +21,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="ModuleInit.Fody" Version="2.1.1" PrivateAssets="all" />
     <PackageReference Include="Moq" Version="4.20.72" />
-    <PackageReference Include="NUnit" Version="4.3.0" PrivateAssets="all" />
+    <PackageReference Include="NUnit" Version="4.3.1" PrivateAssets="all" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.6.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>