Fix broken detection of version in the filename #379

Job	Run time
Alpine Linux	2m 22s
FreeBSD-x86_64 with rust stable	1m 45s
Linux-x86_64 with rust stable	3m 8s
Linux-x86_64 (rustls-native-roots) with rust stable	3m 11s
Linux-x86_64 (native-tls) with rust stable	3m 33s
Linux-x86_64 (native-tls-vendored) with rust stable	4m 7s
Linux-aarch64 with rust stable	2m 25s
Linux-arm with rust stable	2m 29s
Linux-i686 with rust stable	1m 54s
Linux-powerpc with rust stable	1m 48s
Linux-powerpc64 with rust stable	1m 40s
Linux-powerpc64le with rust stable	44s
Linux-riscv64 with rust stable	2m 6s
Linux-s390x with rust stable	1m 59s
NetBSD-x86_64 with rust stable	1m 55s
Windows-aarch64 with rust stable	2m 20s
Windows-i686 with rust stable	4m 36s
Windows-x86_64 with rust stable	7m 11s
macOS-x86_64 with rust stable	2m 8s
macOS-aarch64 with rust stable	2m 47s
Linux-x86_64 with rust beta	3m 15s
Linux-x86_64 with rust nightly	3m 17s
	1h 0m 40s

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