* gnu/packages/crates-web.scm (rust-webpki-roots-0.25): Update to 0.25.4. [cargo-development-inputs]: Add rust-chrono-0.4, rust-csv-1, rust-hex-0.4, rust-num-bigint-0.4, rust-rcgen-0.11, rust-serde-1, rust-x509-parser-0.15, rust-yasna-0.5. Change-Id: Iab81a05ea33785bfff42c8f5fde1aa760e7f590f