Deprecate macos-12 (microsoft#23017)

### Description
<!-- Describe your changes. -->



### Motivation and Context
ESRP code-sign task has supported .net 8, so we can remove macos-12

tools/ci_build/github/azure-pipelines/templates/mac-cpu-packaging-pipeline.yml

@@ -68,9 +68,6 @@ stages:
   jobs:
     - job: MacOS_C_API_Package_Publish
       pool:
-        ${{ if eq(parameters.DoESRP, true)}}:
-          vmImage: 'macOS-12'
-        ${{ else }}:
           vmImage: 'macOS-13'
       steps:
       - checkout: none