Bump third_party/libwebsockets/repo from `c57c239` to `a656eb5` #1479

Job	Run time
REPL Tests - Darwin	0s
REPL Tests - Linux	1h 57m 30s
Test Suites - Darwin (no-ble-no-shell-asan-clang)	1h 28m 48s
Test Suites - Linux (no-ble-no-shell-tsan-clang)	1h 46m 58s
Test Suites - Darwin (no-ble-no-shell-tsan-clang)	1h 41m 25s
	6h 54m 41s

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