Bump Microsoft.NET.Test.Sdk from 17.14.1 to 18.3.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.3.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

tests/PolylineAlgorithm.Tests/PolylineAlgorithm.Tests.csproj

@@ -30,7 +30,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.*" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.*" />
 		<PackageReference Include="MSTest" Version="3.*" />
 		<PackageReference Include="Microsoft.Testing.Platform.MSBuild" Version="1.*" />
 		<PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" Version="17.*" />