Remove magic 7/8 number #13044

Job	Run time
make (check, --enable-shared --enable-load-relative)	5m 0s
make (check, i686)	5m 4s
make (check, ubuntu-24.04, capi)	5m 4s
make (test-bundled-gems)	13m 47s
make (check, --disable-yjit)	3m 18s
make (check, cppflags=-DVM_CHECK_MODE)	5m 3s
ruby-bench (--warmup=1 --bench=1 --excludes=shipit)	14m 26s
make (test-bundler-parallel, 50)	20m 44s
make-ibm	-1s
Ubuntu result	4s
	1h 12m 29s

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