[FEAT] `fix-magento-install` should use the new `get-composer-version` action

[damienwebdev]

💡 Feature request

The Desired Behavior

I'd imagine that we should dog-food our actions.

• https://github.com/mage-os/github-actions/blob/main/fix-magento-install/action.yml

Should use

• https://github.com/mage-os/github-actions/tree/main/get-composer-version

Your Use Case

Reuse.