Bump Microsoft.NET.Test.Sdk from 15.0.0 to 17.3.3

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 17.3.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

dotnetcore-tests/dotnetcore-tests.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.3" />
     <PackageReference Include="MSTest.TestAdapter" Version="1.1.11" />
     <PackageReference Include="MSTest.TestFramework" Version="1.1.11" />
   </ItemGroup>