Update codesign ADO task to the latest using cert authentication (#313)

* Update to the latest codesign task using cert auth

* Update dot net installer ado task

Author: shaynie

CI/Templates/Tasks/pack.yml

@@ -35,7 +35,7 @@ steps:
     contents: '**/*.dll'
     targetFolder: ${{ parameters.UnityFolderPath }}/Plugins
 
-- task: DotNetCoreInstaller@1
+- task: UseDotNet@2
   displayName: Install .NET Core 2.1 runtime
   condition: and(succeeded(), ${{ parameters.Sign }})
   inputs:
@@ -52,11 +52,16 @@ steps:
     alertWarningLevel: 'Medium'
     failOnAlert: true
 
-- task: EsrpCodeSigning@1
+- task: EsrpCodeSigning@5
   # Only codesign during when explicitly marked to sign
   condition: and(succeeded(), ${{ parameters.Sign }})
   inputs:
-    connectedServiceName: 'MRTK Codesign'
+    ConnectedServiceName: 'MixedRealityToolkit Codesign'
+    AppRegistrationClientId: '85be2e6a-8d13-4072-8ff6-f982d6e6e77d'
+    AppRegistrationTenantId: '72f988bf-86f1-41af-91ab-2d7cd011db47'
+    AuthAKVName: 'MixedRealityToolkit-kv'
+    AuthCertName: 'mrtk-esrp-auth-cert'
+    AuthSignCertName: 'mrtk-esrp-sign-cert'
     folderPath: '${{ parameters.UnityFolderPath }}/Plugins'
     signConfigType: 'inlineSignParams'
     inlineOperation: |