chore: update checkpoint issue template to use new commands

[lemmih]

Summary of changes

Changes introduced in this pull request:

• Use use the new forest-cli archive checkpoints command when updating checkpoints.

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

[LesnyRumcajs]

I like it. It does seem to me, given this guide, that we don't meatbag assistance here anymore; this could be fully automated with a cron workflow, right?

[lemmih]

I like it. It does seem to me, given this guide, that we don't meatbag assistance here anymore; this could be fully automated with a cron workflow, right?

Yes, it could be fully automated. Someone should go automate it. :)