shells/fish: 2.2.0 -> 2.3.1

PR: 211688
Changes: https://github.com/fish-shell/fish-shell/releases/tag/2.3.1
Submitted by: Walter Schwarzenfeld <w.schwarzenfeld@utanet.at>
Requested by: Stefan Tatschner <rumpelsepp@sevenbyte.org>
Reviewed by: Aaron Gyes <me@aaron.gy>
Approved by: freebsd.users@gmail.com (maintainer timeout)