[libcxx][Github] Bump container version in premerge CI

This includes e8753c0de90d3aaa60361b5354588fa29fef9228 to bump the
runner version. The contents of the container will remain the same given
we're using the same base image.

GitOrigin-RevId: f7e7132c8edddb78a72ab3f6b9e85f8f920c3773
2 files changed