add lfric version number update

[James Bruten (james-bruten-mo)]

PR Summary

Code Reviewer: Cameron Bateman (@cameronbateman-mo)

This adds a new step for the lfric release to change the version_mod boolean back to true on the main branch once the release is completed.

• linked add version_mod update func SimSys_Scripts#232

Code Quality Checklist

• I have performed a self-review of my own code
• I have locally built the documentation successfully, and the output of changed sections is as expected

Code Review

• The changes are coherent and valid