Update nuget packages.

Author: BDisp

NStackTests/NStackTests.csproj

@@ -10,10 +10,10 @@
     <Version>0.20.0</Version>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
     <PackageReference Include="NUnit" Version="3.13.3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
-    <PackageReference Include="coverlet.collector" Version="3.1.2">
+    <PackageReference Include="NUnit3TestAdapter" Version="4.3.1" />
+    <PackageReference Include="coverlet.collector" Version="3.2.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>