fix: restore pgdata-signal mode to 0755

pgdata-signal is called via sudo as postgres (other user), so it must
be world-executable. 0700 would prevent postgres from running it.

Author: Crispy1975

ansible/tasks/internal/supabase-admin-agent.yml

@@ -53,7 +53,7 @@
     dest: /usr/local/lib/supabase-admin-agent/pgdata-signal
     owner: root
     group: root
-    mode: "0700"
+    mode: "0755"
 
 - name: Setting arch (x86)
   set_fact: