chore(deps): update dependency microsoft.net.test.sdk to v17.8.0

Author: renovate[bot]

src/Promitor.Parsers.Prometheus.Tests/Promitor.Parsers.Prometheus.Tests.csproj

@@ -21,7 +21,7 @@
 
   <ItemGroup>
 	<PackageReference Include="Microsoft.AspNetCore.Http" Version="2.2.2" />
-	<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
+	<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="xunit" Version="2.4.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
       <PrivateAssets>all</PrivateAssets>