PYTHON-5391 Skip C extension build on GraalPy #2347

Job	Run time
Make SDist	42s
Build wheels for manylinux_x86_64	2m 23s
Build wheels for manylinux_aarch64	11m 18s
Build wheels for manylinux_ppc64le	11m 10s
Build wheels for manylinux_s390x	11m 30s
Build wheels for manylinux_i686	2m 28s
Build wheels for win_amd6	5m 27s
Build wheels for win32	6m 49s
Build wheels for macos	3m 31s
Download Wheels	7s
	55m 25s

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