Update mstest monorepo to 3.9.3

Author: renovate[bot]

Adyen.IntegrationTest/Adyen.IntegrationTest.csproj

@@ -11,8 +11,8 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
-        <PackageReference Include="MSTest.TestAdapter" Version="3.8.3" />
-        <PackageReference Include="MSTest.TestFramework" Version="3.8.3" />
+        <PackageReference Include="MSTest.TestAdapter" Version="3.9.3" />
+        <PackageReference Include="MSTest.TestFramework" Version="3.9.3" />
     </ItemGroup>
 
     <ItemGroup>

Adyen.Test/Adyen.Test.csproj

@@ -20,8 +20,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="3.8.3" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.8.3" />
+    <PackageReference Include="MSTest.TestAdapter" Version="3.9.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.9.3" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
   </ItemGroup>