Update NodeVersion default from 20.x to 24.x (#15935)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mikeharder <9459391+mikeharder@users.noreply.github.com>
Co-authored-by: Mike Harder <mharder@microsoft.com>

Author: Copilot

eng/pipelines/templates/stages/archetype-autorest-preview.yml

@@ -2,7 +2,7 @@ parameters:
 # Version of Node.js to use.
 - name: NodeVersion
   type: string
-  default: '20.x'
+  default: '24.x'
 
 # Whether to build alpha versions of the packages. This is passed as a flag to the build script.
 - name: BuildPrereleaseVersion