Update accessibility-alt-text-bot.yml

Author: khiga8

.github/workflows/accessibility-alt-text-bot.yml

@@ -11,6 +11,11 @@ on:
   discussion_comment:
     types: [created, edited]
 
+permissions:
+  issues: write
+  pull-requests: write
+  discussions: write
+
 jobs:
   accessibility_alt_text_bot:
     name: Check alt text is set on issue or pull requests