chore(deps): bump third_party/cmp from `2ac6bca` to `52bfcfa` #5990

Job	Run time
docker-clusterfuzz	1m 25s
docker-bootstrap-node	1m 11s
docker-esp32	1m 49s
docker-fuzzer	11s
docker-toxcore-js	1m 49s
docker-windows-mingw (32)	6m 56s
docker-windows-mingw (64)	7m 22s
docker-bootstrap-node-websocket	20s
	21m 3s

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