Bump third_party/libwebsockets/repo from `816544f` to `26c3f9a` #82931

Job	Run time
Build on Darwin (clang, python_lib, simulated)	1h 17m 59s
Build on Linux (fake, gcc_release, clang, simulated)	1h 16m 51s
Build on Linux (coverage)	13m 55s
Build on Linux (gcc_debug)	1h 3m 37s
Build on Linux (python_lib)	17m 34s
Build on Linux (python lighting-app)	13m 7s
	4h 23m 3s

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