chore: changed to workflow_dispatch in check-outdated-content

Signed-off-by: Sergio Méndez <sergioarm.gpl@gmail.com>

.github/workflows/check-outdated-content.yml

@@ -5,8 +5,8 @@
 name: Check outdated content
 
 on:
-  pull_request:
-
+#  pull_request:
+  workflow_dispatch:
 
 jobs:
   check-outdated-content:
@@ -161,4 +161,4 @@ jobs:
       with:
         update_existing: true
         filename: website/content/zh_files.md
-
+