update test related nugets

Author: penCsharpener

ZulipNUnit/ZulipNUnit.csproj

@@ -7,9 +7,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="nunit" Version="3.11.0" />
+    <PackageReference Include="nunit" Version="3.12.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.13.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.1.1" />
   </ItemGroup>
 
   <ItemGroup>