ci: Bump the GLES CTS version to 3.2.6.1.
This brings in the surfaceless fixes so we don't need to check out the whole repo to cherry pick any more (which was bothering me as I debugged things late in the painfully slow ARM container build process).
This brings in the surfaceless fixes so we don't need to check out the whole repo to cherry pick any more (which was bothering me as I debugged things late in the painfully slow ARM container build process).