downgrade netcore 3.1 sdk

azure-pipelines.yml

@@ -30,9 +30,9 @@ jobs:
     vmImage: 'ubuntu-20.04'
   steps:
   - task: UseDotNet@2
-    displayName: 'Use .NET Core SDK 3.1.423'
+    displayName: 'Use .NET Core SDK 3.1.418'
     inputs:
-      version: 3.1.423
+      version: 3.1.418
 
   - task: UseDotNet@2
     displayName: 'Use .NET Core SDK 6.0.401'
@@ -72,9 +72,9 @@ jobs:
     vmImage: 'macos-12'
   steps:
   - task: UseDotNet@2
-    displayName: 'Use .NET Core SDK 3.1.423'
+    displayName: 'Use .NET Core SDK 3.1.418'
     inputs:
-      version: 3.1.423
+      version: 3.1.418
 
   - task: UseDotNet@2
     displayName: 'Use .NET Core SDK 6.0.401'
@@ -155,9 +155,9 @@ jobs:
     SolutionDir: '$(Build.SourcesDirectory)'
   steps:
   - task: UseDotNet@2
-    displayName: 'Use .NET Core SDK 3.1.423'
+    displayName: 'Use .NET Core SDK 3.1.418'
     inputs:
-      version: 3.1.423
+      version: 3.1.418
 
   - task: UseDotNet@2
     displayName: 'Use .NET Core SDK 6.0.401'