Drop assignees from FMA automated PRs (#29049)

Due to modifications in the Fleet-maintained apps update process,
#g-software engineers are no longer the DRIs for moving update PRs
along.

.github/workflows/ingest-maintained-apps.yml

@@ -93,7 +93,7 @@ jobs:
 
             Generated automatically with cmd/maintained-apps.
           body: Automated ingestion of latest Fleet-maintained app data.
-          assignees: ${{ steps.get_assignee_ids.outputs.github_ids }}
+#          assignees: ${{ steps.get_assignee_ids.outputs.github_ids }}
 
       - name: Close Existing PRs
         if: steps.search_pr.outputs.result != '[]'
@@ -115,4 +115,4 @@ jobs:
                 pull_number: prNumber,
                 state: 'closed',
               });
-            }
+            }