Deserialize old scan results for now due to type discriminator

Author: JamieMagee

test/Microsoft.ComponentDetection.VerificationTests/ComponentDetectionIntegrationTests.cs

@@ -11,6 +11,7 @@ namespace Microsoft.ComponentDetection.VerificationTests;
 using AwesomeAssertions.Execution;
 using Microsoft.ComponentDetection.Contracts.BcdeModels;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Newtonsoft.Json;
 
 [TestClass]
 public class ComponentDetectionIntegrationTests
@@ -283,7 +284,7 @@ private void SetupGithub(string oldGithubArtifactsDir, string newGithubArtifacts
     {
         var oldGithubDirectory = new DirectoryInfo(oldGithubArtifactsDir);
         this.oldLogFileContents = this.GetFileTextWithPattern("GovCompDisc_Log*.log", oldGithubDirectory);
-        this.oldScanResult = JsonSerializer.Deserialize<DefaultGraphScanResult>(this.GetFileTextWithPattern("ScanManifest*.json", oldGithubDirectory));
+        this.oldScanResult = JsonConvert.DeserializeObject<DefaultGraphScanResult>(this.GetFileTextWithPattern("ScanManifest*.json", oldGithubDirectory));
 
         var newGithubDirectory = new DirectoryInfo(newGithubArtifactsDir);
         this.newLogFileContents = this.GetFileTextWithPattern("GovCompDisc_Log*.log", newGithubDirectory);