Bump core versions to 10.5.5/11.2.6

Issue information

From user: fjgarlin

Related to !422 (merged)

Contribution record

Fork management

Problem/Motivation

Per https://git.drupalcode.org/project/gitlab_templates/-/jobs/7174824

Edited by drupalbot
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information