Update version to [v16] for [ERPNext]

[laozhou0731]

What type of your feature request?

Change the W9_VERSION to target version number at .env and test it

Research and development steps your need to do

• Check the official installation docs of this application
• Add a comment with docker logs
• If need to update documentation, add issue at Websoft9 docs

How to commit your change to docker-library?

docker exec -it websoft9-apphub bash
apphub commit --appid --github_token

Testing steps

• Upload your sreenshoot to PR
• Automation testing when submit PR to dev branch
• System testing for dev branch

[zhaojing1987]

done