[TASK] Update `COMPOSER_ROOT_VERSION` in `Build/Scripts/runTests.sh`

The COMPOSER_ROOT_VERSION environment variable in
`Build/Scripts/runTests.sh` has not been updated.

This change corrects this.

Resolves: #103073
Releases: main
Change-Id: I9fa3406ac471e749546473db10db3020d4f92685
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82857


Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>