Fix npm_channel options in manual release workflow. (#8766)

Author: scidomino

.github/workflows/release-manual.yml

@@ -16,9 +16,11 @@ on:
         required: true
         type: 'choice'
         options:
-          - 'stable'
           - 'preview'
+          - 'nightly'
+          - 'latest'
           - 'dev'
+        default: 'dev'
       dry_run:
         description: 'Run a dry-run of the release process; no branches, npm packages or GitHub releases will be created.'
         required: true