Bump third_party/cirque/repo from `16e8668` to `550c926` #1518

Job	Run time
Build on Linux (fake, gcc_release, clang, simulated)	2h 4m 17s
Build on Linux (gcc_debug)	1m 52s
Build on Linux (python_lib)	29m 22s
Build on Darwin (clang, python_lib, simulated)	1h 15m 39s
Build on Linux (coverage)	2m 10s
Build on Linux (python lighting-app)	5m 57s
	3h 59m 17s

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