Update seastar submodule
Update seastar submodule

* seastar 41c83ec...fd9af3a (7):
  > stall_detector: Delete unused member variable
  > future: Avoid a move in finally_body
  > Merge "Followup cleanups for the apply/invoke split" from Rafael
  > Merge "make trivial future related functions noexcept" from Benny
  > rpc_test: silence depreceted lambda logger warning
  > rpc_demo: stop using variadic futures
  > future: Move two static_asserts to the top

scylladb/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla