Bump third_party/libwebsockets/repo from `c57c239` to `a74362f` #369

Job	Run time
REPL Tests - Linux	1h 42m 8s
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 24m 23s
Test Suites - Linux (no-ble-no-shell-tsan-clang)	1h 48m 12s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	1h 54m 56s
REPL Tests - Darwin	0s
	6h 49m 39s

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