Update ESRP to v2, remove netcore 2.1 (#2388)

Author: jviau

azure-pipelines-release-dotnet-isolated.yml

@@ -8,12 +8,6 @@ pool:
     - ImageOverride -equals MMS2022TLS
 
 steps:
-- task: UseDotNet@2
-  displayName: 'Use the .NET Core 2.1 SDK (required for build signing)'
-  inputs:
-    packageType: 'sdk'
-    version: '2.1.x'
-
 - task: UseDotNet@2
   displayName: 'Use the .NET 6 SDK'
   inputs:
@@ -40,7 +34,7 @@ steps:
 
 # Authenticode sign all the DLLs with the Microsoft certificate.
 # This appears to be an in-place signing job, which is convenient.
-- task: SFP.build-tasks.custom-build-task-1.EsrpCodeSigning@1
+- task: SFP.build-tasks.custom-build-task-1.EsrpCodeSigning@2
   displayName: 'ESRP CodeSigning: Authenticode'
   inputs:
     ConnectedServiceName: 'ESRP Service'
@@ -91,7 +85,7 @@ steps:
 
 # Digitally sign all the nuget packages with the Microsoft certificate.
 # This appears to be an in-place signing job, which is convenient.
-- task: SFP.build-tasks.custom-build-task-1.EsrpCodeSigning@1
+- task: SFP.build-tasks.custom-build-task-1.EsrpCodeSigning@2
   displayName: 'ESRP CodeSigning: Nupkg'
   inputs:
     ConnectedServiceName: 'ESRP Service'