Bump third_party/cirque/repo from `16e8668` to `550c926` #1659

Job	Run time
Build on Darwin (clang, simulated)	47m 4s
Build on Linux (coverage)	55m 0s
Build on Linux (gcc_debug)	1h 0m 47s
Build on Linux (fake, gcc_release, clang, simulated)	1h 39m 23s
Build on Linux (python_lib)	1h 31m 54s
Build on Linux (python lighting-app)	2h 7m 56s
	8h 2m 4s

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