Bump third_party/libwebsockets/repo from `a1cbc02` to `816544f` #82361

Job	Run time
Build on Darwin (clang, python_lib, simulated)	1h 6m 4s
Build on Linux (fake, gcc_release, clang, simulated)	2h 24m 32s
Build on Linux (coverage)	14m 27s
Build on Linux (gcc_debug)	1h 11m 40s
Build on Linux (python_lib)	25m 48s
Build on Linux (python lighting-app)	8m 13s
	5h 30m 44s

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