Updates all the way to 19.0.8

.devops/build-nuget.yaml

@@ -1,5 +1,5 @@
 variables:
-  PackageVersion: 13.5.1.$(Build.BuildId)
+  PackageVersion: 19.0.9.$(Build.BuildId)
   projectAPI:  './ElectronNET.API/ElectronNET.API.csproj'
   projectCLI:  './ElectronNET.CLI/ElectronNET.CLI.csproj'
 
@@ -20,7 +20,7 @@ steps:
   displayName: 'Use .NET Core sdk'
   inputs:
     packageType: sdk
-    version: 5.0.203
+    version: 6.0.100
     installationPath: $(Agent.ToolsDirectory)/dotnet
 
 - task: DotNetCoreCLI@2
@@ -55,6 +55,7 @@ steps:
     configuration: 'Release'
     versioningScheme: 'off'
     buildProperties: 'Version=$(PackageVersion)'
+    arguments: -IncludeReferencedProjects
 
 - task: DotNetCoreCLI@2
   inputs:

ElectronNET.API/AutoUpdater.cs

@@ -313,7 +313,7 @@ public event Action<UpdateInfo> OnUpdateDownloaded
         private event Action<UpdateInfo> _updateDownloaded;
 
         private static AutoUpdater _autoUpdater;
-        private static object _syncRoot = new object();
+        private static readonly object _syncRoot = new();
 
         internal AutoUpdater() { }
 
@@ -426,6 +426,7 @@ public Task<UpdateCheckResult> CheckForUpdatesAndNotifyAsync()
         /// <param name="isForceRunAfter">Run the app after finish even on silent install. Not applicable for macOS. Ignored if `isSilent` is set to `false`.</param>
         public void QuitAndInstall(bool isSilent = false, bool isForceRunAfter = false)
         {
+            BridgeConnector.EmitSync("prepare-for-update");
             BridgeConnector.EmitSync("autoUpdaterQuitAndInstall", isSilent, isForceRunAfter);
         }