Fix url to download files for NetBSD issue workaround #37

Job	Run time
FreeBSD-x86_64 with rust stable	46s
Linux-x86_64 with rust stable	57s
Linux-aarch64 with rust stable	1m 24s
Linux-arm with rust stable	1m 3s
Linux-i686 with rust stable	55s
Linux-powerpc with rust stable	1m 11s
Linux-powerpc64 with rust stable	50s
Linux-powerpc64le with rust stable	58s
Linux-riscv64 with rust stable	1m 7s
Linux-s390x with rust stable	1m 0s
NetBSD-x86_64 with rust stable	1m 0s
Windows-aarch64 with rust stable	1m 2s
Windows-i686 with rust stable	1m 39s
Windows-x86_64 with rust stable	1m 6s
macOS-x86_64 with rust stable	46s
macOS-aarch64 with rust stable	39s
Linux-x86_64 with rust beta	55s
Linux-x86_64 with rust nightly	44s
	18m 2s

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