chore(deps): update rust crate clap_mangen to v0.2.26 #297

Job	Run time
cargo fmt --all -- --check	12s
cargo check (ubuntu-latest)	15s
cargo clippy -- -D warnings (ubuntu-latest)	19s
cargo check (macOS-latest)	23s
Code Coverage (ubuntu-latest, unix)	1m 40s
cargo clippy -- -D warnings (macOS-latest)	24s
cargo check (windows-latest)	56s
Code Coverage (macos-latest, macos)	1m 28s
cargo test (ubuntu-latest)	26s
cargo clippy -- -D warnings (windows-latest)	42s
Code Coverage (windows-latest, windows)	3m 45s
cargo test (macOS-latest)	28s
cargo test (windows-latest)	57s
	11m 55s

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