fix(clippy): use sort_by_key with Reverse for descending sort

[mateodelnorte]

Caught by Rust 1.95.0's unnecessary_sort_by lint. Same pattern as gitkb/meta_cli#23 — sort_by(|a, b| b.cmp(&a)) is equivalent to sort_by_key(|x| std::cmp::Reverse(x)). DateTime<Utc> is Copy, so no allocation/clone concerns. Unblocks gitkb/meta#78.

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