Update automation for incoming issues (#13629)

GitHub appears to be deprecating addProjectNextItem by not allowing it to be used alongside projectV2 to get the project ID, so switching to using addProjectV2ItemById instead.

.github/workflows/triage-incoming.yml

@@ -14,13 +14,13 @@ jobs:
         with:
           headers: '{"GraphQL-Features": "projects_next_graphql"}'
           query: |
-            mutation add_to_project($projectid:ID!,$contentid:ID!) {
-              addProjectNextItem(input:{projectId:$projectid contentId:$contentid}) {
-                projectNextItem {
+              mutation add_to_project($projectid:ID!,$contentid:ID!) {
+                addProjectV2ItemById(input: {projectId: $projectid contentId: $contentid}) {
+                item {
                   id
+                  }
                 }
               }
-            }
           projectid: ${{ env.PROJECT_ID }}
           contentid: ${{ github.event.issue.node_id }}
         env: