Include example codes in version update script #5983

Is your feature request related to a problem or challenge?

Version number in our examples are easy to forget, we should keep them up to date as well

Describe the solution you'd like

Maybe we could update the script here to automatically clean it up: https://github.com/apache/arrow-datafusion/blob/main/dev/update_datafusion_versions.py

Originally posted by @alamb in #5962 (comment)