build: update pull request ng-dev config

Updated label types to reflect changes in ng-dev

Author: alan-agius4

.ng-dev/pull-request.mts

@@ -9,7 +9,7 @@ export const pullRequest: PullRequestConfig = {
     default: 'rebase',
     labels: [{ pattern: 'squash commits', method: 'squash' }],
   },
-  mergeReadyLabel: /^action: merge(-assistance)?/,
-  caretakerNoteLabel: /(action: merge-assistance)/,
-  commitMessageFixupLabel: 'commit message fixup',
+  mergeReadyLabel: 'action: merge',
+  caretakerNoteLabel: 'action: merge-assistance',
+  commitMessageFixupLabel: 'needs commit fixup',
 };