Bump third_party/libwebsockets/repo from `a1cbc02` to `816544f` #82360

Job	Run time
Build on Darwin (clang, python_lib, simulated)	52m 57s
Build on Linux (fake, gcc_release, clang, simulated)	1h 47m 4s
Build on Linux (coverage)	16m 27s
Build on Linux (gcc_debug)	1h 30m 50s
Build on Linux (python_lib)	26m 28s
Build on Linux (python lighting-app)	8m 17s
	5h 2m 3s

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