Fix typo in mise command in ELI5

What does this merge request do and why?

This MR fixes a typo in the mise command when setting up ELI5 project.

❯ mise insstall -y
error: unrecognized subcommand 'insstall'

  tip: some similar subcommands exist: 'i', 'list', 'list-all', 'uninstall', 'install'

Usage: mise [OPTIONS] <COMMAND>

For more information, try '--help'.

How to set up and validate locally

1. Ensure GitLab ELI5 is enabled by adding the below configuration in gdk.yml:

   ---
   gitlab_eli5:
     enabled: true
   mise:
     enabled: true

2. Check out to this merge request's branch.
3. Run gdk reconfigure to check if regenerating all configuration is successful.
4. Run make gitlab-eli5-asdf-install and confirm the error no longer shows.

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise an issue to follow-up.
• Documentation added/updated, if needed.
• Announcement added, if change is notable.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.