fix build (test runtime)

Author: Bertk

eng/build.yml

@@ -4,10 +4,15 @@ steps:
     version: 6.0.428
   displayName: Install .NET Core SDK 6.0.428
 
+- task: UseDotNet@2
+  inputs:
+    version: 8.0.114
+  displayName: Install .NET Core SDK 8.0.114
+
 - task: UseDotNet@2
   inputs:
     useGlobalJson: true
-  displayName: Install .NET Core SDK 8.0.113
+  displayName: Install .NET Core SDK 9.0.202
 
 # create artifact/package folder
 - pwsh: |