Image changes from shimmer to iota evm (#6856)

# Description of change

This PR brings up an updated image (shimmer to iota network) in ISC
tutorials.

# Links to any relevant issues

fixes #6866 

## Type of change

- Documentation Fix

## How the change has been tested

changes were built locally.

## Change checklist

- [x] I have followed the contribution guidelines for this project
- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] I have made corresponding changes to the documentation
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] I have checked that new and existing unit tests pass locally with
my changes

Author: vivekjain23