Bump MSTest.TestFramework from 3.7.3 to 3.8.3 in /ContestProjectTests (#39)

Bumps [MSTest.TestFramework](https://github.com/microsoft/testfx) from 3.7.3 to 3.8.3.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.7.3...v3.8.3)

---
updated-dependencies:
- dependency-name: MSTest.TestFramework
  dependency-version: 3.8.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

ContestProjectTests/ContestProjectTests.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net8.0-windows</TargetFramework>
@@ -13,7 +13,7 @@
     <PackageReference Include="FluentAssertions" Version="7.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.7.3" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.7.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.8.3" />
   </ItemGroup>
 
   <ItemGroup>