Replace unmaintained humantime crate with jiff

[oherrala]

The crate humantime appears to be unmaintained. There's open PR in RustSec's advisory-db about this: rustsec/advisory-db#2249

The crates clap and env_logger have already made the switch from humantime to jiff:

• chore(deps): Switch humantime to jiff clap-rs/clap#5944
• chore(deps): Switch humantime to jiff rust-cli/env_logger#352

The jiff crate is already dependency on cargo via gix (albeit old 0.1 version, but that's probably fixed in next gix release):

jiff v0.1.29
└── gix-date v0.9.3
    ├── gix v0.70.0
    │   └── cargo v0.88.0 (/Users/oherrala/rust/cargo)

This PR shouldn't have any functional change to cargo itself.

[rustbot]

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[epage]

- [DIRTY] foo v0.0.1 ([ROOT]/foo): the dependency foo was rebuilt ([TIME_DIFF_AFTER_LAST_BUILD])
+ [DIRTY] foo v0.0.1 ([ROOT]/foo): the dependency foo was rebuilt (1741638048.881853669s, PT1S after last build at 1741638047.743836231s)

Our regex at

cargo/crates/cargo-test-support/src/compare.rs

Lines 243 to 251 in 340d123

	// Following 3 subs redact:
	// "1719325877.527949100s, 61549498ns after last build at 1719325877.466399602s"
	// "1719503592.218193216s, 1h 1s after last build at 1719499991.982681034s"
	// into "[DIRTY_REASON_NEW_TIME], [DIRTY_REASON_DIFF] after last build at [DIRTY_REASON_OLD_TIME]"
	subs.insert(
	"[TIME_DIFF_AFTER_LAST_BUILD]",
	regex!(r"(?<redacted>[0-9]+(\.[0-9]+)?s, (\s?[0-9]+(\.[0-9]+)?(s|ns|h))+ after last build at [0-9]+(\.[0-9]+)?s)"),
	)
	.unwrap();

is not matching anymore to redact this test output