Update seastar submodule
* seastar 55a821524d...ae8449e04f (22):
> Revert "Merge 'reactor: merge pollfn on I/O paths into a single one' from Kefu Chai"
> http/exception: Make unexpected status message more informative
> docker: bump up to clang {16,17} and gcc {12,13}
> doc: replace space (0xA0) in unicode with ASCII space (0x20)
> file: Remove reactor class friendship
> dpdk: adjust for poller in internal namespace
> http: make_requests accept optional expected
> Merge 'future: future_state_base: assert owner shard in debug mode' from Benny Halevy
> Merge 'Keep pollers in internal/poll.hh' from Pavel Emelyanov
> sharded: access instance promise only on instance shard
> test: network_interface_test: add tests for format and parse
> Merge 'reactor: merge pollfn on I/O paths into a single one' from Kefu Chai
> reactor/scheduling_group: Handle at_destroy queue special in init_new_scheduling_group_key etc (v2)
> reactor: set local_engine after it is fully initialized
> build: do not error when running into GCC BZ-1017852
> Merge 'shared_future: make available() immediate after set_value()' from Piotr Dulikowski
> tls: add format_as(subject_alt_name_type) overload
> tls: linearize small packets on send
> shared_future: remove unused #include
> shared_ptr: add fmt::formatter for shared_ptr types
> lazy: add fmt::formatter for lazy_eval types
> Merge 'file: use unbuffered generator in experimental_list_directory()' from Kefu Chai
Closes scylladb/scylladb#16274
This commit is contained in: