Bump Microsoft.NET.Test.Sdk from 18.3.0 to 18.5.1

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Tpk.Tests/Tpk.Tests.csproj

@@ -7,7 +7,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
 		<PackageReference Include="NUnit" Version="4.5.1" />
 		<PackageReference Include="NUnit.Analyzers" Version="4.13.0">
 			<PrivateAssets>all</PrivateAssets>