Increase assert_cmd dependency lower bound to 2.2.0 #6873

Job	Run time
stratis-cli-checks	13m 6s
stratis-min-cli-checks	2m 52s
python-based-tests	2m 37s
tests-with-testing-repo (master)	29m 41s
checks (make -f Makefile fmt-ci, rustfmt)	1m 5s
shell-checks	30s
checks (make -f Makefile check-typos, cargo)	1m 3s
	50m 54s

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