Update from macOS-11 to macOS-latest to avoid manual upgrade every time (#25328)

Author: vidai-msft

.azure-pipelines/live-test.yml

@@ -10,11 +10,11 @@ parameters:
 - name: os_linux
   displayName: Linux Image Version
   type: string
-  default: ubuntu-20.04
+  default: ubuntu-latest
 - name: os_macos
   displayName: MacOS Image Version
   type: string
-  default: macOS-11
+  default: macOS-latest
 - name: win_ps_5_1
   displayName: Windows PowerShell 5.1 Version
   type: string

.azure-pipelines/powershell-core.yml

@@ -7,7 +7,7 @@ variables:
   LinuxAgentPoolVMImage: ''
   MacOSName: macOS
   MacOSAgentPoolName: 'Azure Pipelines'
-  MacOSAgentPoolVMImage: macOS-11
+  MacOSAgentPoolVMImage: macOS-latest
   TestFramework: net6.0
   TestTarget: Test
   Configuration: Debug

.azure-pipelines/release-test.yml

@@ -42,7 +42,7 @@ variables:
   linuxAgentPoolName: pool-ubuntu-2004
   linuxAgentPoolVMImage: ''
   macOsAgentPoolName: Azure Pipelines
-  macOsAgentPoolVMImage: macOS-11
+  macOsAgentPoolVMImage: macOS-latest
 
 pr: none
 trigger: none