Update Azure Pipelines to install .NET Core SDK 9 and .NET Aspire workload

Author: KrzysztofPajak

azure-pipelines.yml

@@ -10,19 +10,17 @@ services:
 
 steps:
 - task: UseDotNet@2
-  displayName: 'Install .NET Core SDK 8'
+  displayName: 'Install .NET Core SDK 9'
   inputs:
     version: '9.0.x'
 
 #- script: dotnet tool install -g Aspire
 #  displayName: 'Install Aspire globally'
 
-- task: DotNetCoreCLI@2
-  displayName: 'Install Aspire globally'
-  inputs:
-    command: custom
-    custom: 'tool'
-    arguments: 'install -g Aspire'
+- task: Install .NET Aspire workload
+  inputs: 
+      inlineScript: |
+          dotnet workload install aspire
 
 - task: NuGetToolInstaller@1
   displayName: 'Install NuGet >=6.3.0-0'