macOS

Fix bundled gems' indentations and link to their repos #7863

Job	Run time
make (check, macos-14)	6m 31s
make (check, macos-14, --with-gcc=gcc-14)	7m 37s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	6m 31s
make (check, macos-14, --with-gmp)	5m 43s
make (test-all, --repeat-count=2, macos-14)	9m 17s
make (test-bundler-parallel, macos-14)	16m 49s
make (test-bundled-gems, macos-14)	8m 18s
make (check, macos-15)	5m 56s
make (check, macos-13)	12m 20s
macOS result	1s
	1h 19m 3s

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