Drupal 11.3 and 10.6 are released - update variant variables

Migrated issue

Reported by: jonathan1055

Related to !441 (merged)

Problem/Motivation

The "check verisons" jobs reports that Drupal 11.3.0 has been released today.
https://git.drupalcode.org/issue/gitlab_templates-3562253/-/jobs/7696041

https://www.drupal.org/project/drupal/releases/11.3.0
https://www.drupal.org/project/drupal/releases/10.6.0

Proposed resolution

• Update CORE_STABLE from 11.2.10 to 11.3.0
• Update CORE_PREVIOUS_MINOR from 11.1.9 to 11.2.10
• Update the script variable NEXT_MINOR_STABLE to 11.4.0

Remaining tasks

Related issue: Issue #3561429