Update seastar submodule
* seastar 124467d...0489655 (9): > alloc_failure_injector: Fix compilation error with gcc 7.1 > alloc_failure_injector: Replace set_alloc_failure_callback() with run_with_callback() > alloc_failure_injector: Log backtrace of failures > alloc_failure_injector: Extract fail() > util: Introduce support for allocation failure injection > noncopyable_function: improve support for capturing mutable lambdas > noncopyable_function add bool operator > test.py: fix typo in noncopyable_function_test > utils: introduce noncopyable_function
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