Add xtask msrv #1349

Job	Run time
tests (Centos 8, ubuntu-latest, centos8)	9m 0s
tests (Fedora 32, ubuntu-latest, fedora32)	7m 29s
tests (Fedora 33, ubuntu-latest, fedora33)	8m 10s
tests (Fedora 34, ubuntu-latest, fedora34)	7m 48s
tests (Fedora 35, ubuntu-latest, fedora35)	6m 29s
tests (Debian Testing, ubuntu-latest, debiantesting)	7m 22s
tests (Ubuntu 18.04, ubuntu-latest, ubuntu1804)	8m 0s
tests (Ubuntu 20.04, ubuntu-latest, ubuntu2004)	7m 28s
tests (Ubuntu 22.04, ubuntu-latest, ubuntu2204)	6m 58s
tests (Mac OS 12.latest)	11m 13s
tests (OpenSUSE 15, ubuntu-latest, opensuse15)	6m 24s
tests (Archlinux Base (Rolling), ubuntu-latest, arch)	8m 4s
tests (Mac OS 13.latest)	5m 58s
	1h 40m 23s

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