[Chapel Merge] Updated Dockerfile and README to reflect the lates

Branch: refs/heads/1.23-for-EX
Revision: 50d79ac
Author: gbtitus
Log Message:

Merge pull request #16591 from soohoonchoi/dockerupdate_1.23

Updated Dockerfile and README to reflect the latest release of 1.23.0

Modified Files:
M util/dockerfiles/Dockerfile
M util/dockerfiles/README.md

Compare: https://github.com/chapel-lang/chapel/compare/1.23-for-EX