chore(deps): update rust crate assert_cmd to v2.1.0 #472

Job	Run time
cargo fmt --all -- --check	5s
cargo test (ubuntu-latest)	36s
cargo test (macOS-latest)	2m 21s
cargo check (ubuntu-latest)	13s
GNU test suite	1m 0s
cargo test (windows-latest)	4m 15s
cargo clippy -- -D warnings (macOS-latest)	13s
cargo check (macOS-latest)	11s
cargo check (windows-latest)	1m 4s
Code Coverage (macos-latest, macos)	2m 50s
Code Coverage (windows-latest, windows)	6m 33s
cargo clippy -- -D warnings (ubuntu-latest)	26s
Code Coverage (ubuntu-latest, unix)	1m 50s
cargo clippy -- -D warnings (windows-latest)	1m 0s
	22m 37s

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