Update seastar submodule
* seastar 1204efbc...ed7a0f54 (46): > gate: s/intgernal/internal/ > reactor: set reactor::_stopping to true on all shards > condition-variable: replace the coroutine wakeup task with a promise > tutorial: explain the buffer_size_t param of generator coroutine > log: call log_level_map explicitly in constructor > future: de-variadicate make_ready_future() and similar helpers > timer-set,scollectd: remove unnecessary ";" > util/conversion: remove inclusion guards > foreign_ptr: destroy: use run_in_background > abort_source, abortable_fifo: use is_nothrow_invocable_r_v<> > alien: add type constraint for alien::run_on and alien::submit_to > alien: add noexcept specifier for lambda passed to run_on() > test: alien_test: test alien::run_on() also > test: alien_test: throw if unexpected things happens > future: make API level 6 mandatory > api-level: update IDE fallback > core/on_internal_error: always log error with backtrace > future: make API level 5 mandatory > websocket: fix frame parsing. > websocket: fix frame assembling. > when_all: drop code for API_LEVEL < 4 > future: drop internal call_then_impl > future: when_all_succeed(): make API level 4 mandatory > reactor: trade comment for type constraints > sstring: s/is_invocable_r/is_invocable_r_v/ > doc: compatibility: document API levels 5 and 6 > demos: file_demo: pass a string_view to_open_file_dma() > TLS: Add issuer/subject info to verification error message > test: fstream_test: drop unnecessary API_LEVEL check > manual_clock: advance: use run_in_background to expire_timers > reactor: add run_in_backround and close > websocket: shutdown input first. > websocket: use gate to guard background tasks. > websocket: remove trailing spaces. > websocket_demo: ignore sleep_aborted exception. > websocket_demo: fix coredump. > fstream: drop API level 2 (make_file_output_stream() returning non-future) > core/sstring: do not use ostream_formatter > metrics: use fmt::to_string() when creating a label > backtrace: fix size calculation in dl_iterate_phdr > Downgrade expected stall detector warning to info > fix: Add missing inline code blocks > spawn_test: fix /bin/cat stuck in reading input. > reactor: pass fd opened in blocking mode to spawned process > reactor: skip sigaction if handler has been registered before. > reactor: allow registering handler multiple times for a signal.
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