Add xtask msrv #1350

Job	Run time
tests (Mac OS 12.latest)	6m 5s
tests (Mac OS 13.latest)	5m 11s
tests (Centos 8, ubuntu-latest, centos8)	7m 25s
tests (Fedora 32, ubuntu-latest, fedora32)	8m 6s
tests (Fedora 33, ubuntu-latest, fedora33)	5m 22s
tests (Fedora 34, ubuntu-latest, fedora34)	7m 12s
tests (Fedora 35, ubuntu-latest, fedora35)	8m 35s
tests (Debian Testing, ubuntu-latest, debiantesting)	3m 40s
tests (Ubuntu 18.04, ubuntu-latest, ubuntu1804)	6m 7s
tests (Ubuntu 20.04, ubuntu-latest, ubuntu2004)	6m 11s
tests (Ubuntu 22.04, ubuntu-latest, ubuntu2204)	3m 50s
tests (OpenSUSE 15, ubuntu-latest, opensuse15)	4m 12s
tests (Archlinux Base (Rolling), ubuntu-latest, arch)	6m 26s
	1h 18m 22s

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