gnu: Remove rust-regex-1.1.
* gnu/packages/crates-io.scm (rust-regex-1.1): Remove variable.
(rust-bindgen-0.50, rust-bindgen-0.49, rust-clap-2,
rust-compiletest-rs-0.2, rust-console-0.7, rust-docopt-1.1,
rust-env-logger-0.7, rust-env-logger-0.6, rust-env-logger-0.5,
rust-gimli-0.18, rust-globset-0.4, rust-grep-cli-0.1,
rust-grep-matcher-0.1, rust-grep-regex-0.1, rust-grep-searcher-0.1,
rust-ignore-0.4, rust-nom-5, rust-nom-4.2, rust-once-cell-1.2,
rust-proptest-0.9, rust-proptest-0.8, rust-pulldown-cmark-0.4,
rust-regex-automata-0.1, rust-rusqlite-0.19, rust-syn-0.15,
rust-ucd-parse-0.1, rust-version-sync-0.8) [arguments]: Replace
rust-regex-1.1 with 1.3.
* gnu/packages/rust-apps.scm (ripgrep)[arguments]: Same.
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