Tweak actions config to use different key names in matrix #326

Job	Run time
FreeBSD-x86_64 with rust stable	1m 3s
Linux-x86_64 with rust stable	3m 16s
Linux-x86_64 (rustls-native-roots) with rust stable	3m 24s
Linux-x86_64 (native-tls) with rust stable	3m 20s
Linux-x86_64 (native-tls-vendored) with rust stable	4m 3s
Linux-aarch64 with rust stable	2m 21s
Linux-arm with rust stable	2m 23s
Linux-i686 with rust stable	2m 0s
Linux-powerpc with rust stable	1m 45s
Linux-powerpc64 with rust stable	1m 48s
Linux-powerpc64le with rust stable	1m 47s
Linux-riscv64 with rust stable	2m 2s
Linux-s390x with rust stable	1m 52s
NetBSD-x86_64 with rust stable	1m 55s
Windows-aarch64 with rust stable	1m 38s
Windows-i686 with rust stable	4m 53s
Windows-x86_64 with rust stable	6m 54s
macOS-x86_64 with rust stable	2m 16s
macOS-aarch64 with rust stable	59s
Linux-x86_64 with rust beta	3m 15s
Linux-x86_64 with rust nightly	3m 15s
	56m 9s

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