macOS

[rubygems/rubygems] Update parallel_tests. #609

Job	Run time
make (test-bundler-parallel, macos-14)	24m 43s
make (check, macos-14)	7m 20s
make (check, macos-14, --with-gcc=gcc-14)	9m 12s
make (test-bundled-gems, macos-14)	10m 52s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	7m 21s
make (check, macos-13)	13m 23s
make (test-all, --repeat-count=2, macos-14)	9m 31s
make (check, macos-15)	7m 1s
make (check, macos-14, --with-gmp)	7m 16s
macOS result	3s
	1h 36m 42s

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