Bump to macos-13 AzDO image

The macos-12 one is being removed.

Author: akoeplinger

eng/azure-pipelines-public.yml

@@ -152,7 +152,7 @@ stages:
               clangTargetArg: /p:ClangTarget=aarch64-apple-darwin
               archflag: --arch arm64
         pool:
-          vmImage: macos-12
+          vmImage: macos-13
         steps:
         - bash: |
             set -ex

eng/azure-pipelines.yml

@@ -168,7 +168,7 @@ extends:
               - _BuildConfig: Release
               pool:
                 name: Azure Pipelines
-                image: macos-12
+                image: macos-13
                 os: macOS
               steps:
               - bash: |