feeder: set deadlock_timeout to 10 seconds (#54658)

It makes wcs-olap always win in a deadlock with another client.

wcs_olap/feeder.py

@@ -602,6 +602,7 @@ class WcsOlapFeeder(object):
         self.ex('COMMENT ON TABLE {generic_evolution_table} IS %s', vars=('evolution générique',))
 
     def feed(self):
+        self.ex("SET deadlock_timeout = '10s'")
         try:
             if self.do_feed:
                 self.do_schema()