[IMP] queue_job: use state constant in lock function

Author: sbidoul

queue_job/job.py

@@ -261,11 +261,11 @@ def lock(self) -> bool:
                         queue_job
                     WHERE
                         uuid = %s
-                        AND state='started'
+                        AND state = %s
                 )
             FOR UPDATE SKIP LOCKED;
         """,
-            [self.uuid],
+            [self.uuid, STARTED],
         )
 
         # 1 job should be locked