Bump NUnit3TestAdapter from 5.1.0 to 5.2.0 (#45)

Author: dependabot[bot]

test/Diffs.Test.csproj

@@ -15,7 +15,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="NUnit3TestAdapter" Version="5.1.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="5.2.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
   </ItemGroup>