Add missing semicolon to finalize_drop_subscriptions.sql

Signed-off-by: Tristan Partin <tristan@neon.tech>

compute_tools/src/sql/finalize_drop_subscriptions.sql

@@ -17,5 +17,5 @@ BEGIN
     INSERT INTO neon.drop_subscriptions_done VALUES (1, current_setting('neon.timeline_id'))
     ON CONFLICT (id) DO UPDATE
     SET timeline_id = current_setting('neon.timeline_id');
-END
-$$
+END;
+$$;