How can I use pex 2.6.0 with pants 2.21.0?

Within the

[pex-cli]

subsystem, set the

version

option to

v2.6.0

and

known_versions

to the hash/length of the artifact attached to the pex github release https://www.pantsbuild.org/2.21/docs/python/overview/pex#setting-pex-and-pip-versions