Fix log level

Author: r4victor

src/dstack/_internal/server/background/tasks/process_fleets.py

@@ -58,7 +58,7 @@ async def _process_next_fleet():
 
 
 async def _process_fleet(session: AsyncSession, fleet_model: FleetModel):
-    logger.info("Processing fleet %s", fleet_model.name)
+    logger.debug("Processing fleet %s", fleet_model.name)
     # Refetch to load related attributes.
     # joinedload produces LEFT OUTER JOIN that can't be used with FOR UPDATE.
     res = await session.execute(