textproc/teckit: update 2.5.1 -> 2.5.7

PR: 220692
Changes: https://github.com/silnrsi/teckit/releases
Submitted by: Zsolt Udvari <uzsolt@uzsolt.hu>
Reviewed by: dbaio, ultima
Approved by: nikola.lecic@anthesphoria.net (maintainer timeout)