Bump league/commonmark in the composer group across 1 directory

Bumps the composer group with 1 update in the / directory: [league/commonmark](https://github.com/thephpleague/commonmark).


Updates `league/commonmark` from 2.8.1 to 2.8.2
- [Release notes](https://github.com/thephpleague/commonmark/releases)
- [Changelog](https://github.com/thephpleague/commonmark/blob/2.8/CHANGELOG.md)
- [Commits](thephpleague/commonmark@2.8.1...2.8.2)

---
updated-dependencies:
- dependency-name: league/commonmark
  dependency-version: 2.8.2
  dependency-type: indirect
  dependency-group: composer
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]