dep: Update mstest monorepo to 3.9.0

Author: renovate[bot]

UnitTest/UnitTest.csproj

@@ -8,8 +8,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="3.8.3" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.8.3" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.9.0" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.9.0" />
   </ItemGroup>
 
   <ItemGroup>