Make cycle detector test less likely to time out #2892

Job	Run time
arm Linux glibc	28m 11s
riscv64 Linux glibc	23m 15s
aarch64 Linux glibc	19m 38s
armhf Linux glibc	28m 14s
Lint bash, docker, markdown, and yaml	1m 41s
Validate GNU Docker image builds	32s
Validate GNU Docker release image builds	39s
Validate musl Docker image builds	18s
Validate musl Docker release image builds	18s
Validate Windows Docker image builds	1m 16s
Validate Windows Docker release image builds	1m 53s
Verify CHANGELOG is valid	5s
x86-64 Linux glibc	21m 55s
arm64 Apple Darwin	15m 24s
x86-64 Apple Darwin	33m 1s
x86-64 Linux musl	23m 49s
x86-64 Windows MSVC	38m 8s
with sanitizers pool_memalign,address_sanitizer,undefined_behavior_sanitizer	1h 33m 13s
use dtrace	21m 23s
use pool_memalign	23m 46s
use runtimestats	21m 15s
	6h 37m 54s

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