Fix dependency declarations

What is the expected minimum, 10.3? or 10.0?

Good catch

I think we should update here: https://git.drupalcode.org/project/modal_page/-/blob/5.1.0/modal_page.in...
To ^10.3

Or remove this dependency: https://git.drupalcode.org/project/modal_page/-/blob/5.1.0/modal_page.in...

You're right

I don't remember why we have this dependency on 'drupal:system (>= 10.3)'

Will be necessary investigate better

Anyway, I'm not sure if it's critical. Maybe you can't install Modal, but I wouldn't break the site for example

If you have a different opinion why do you think it's critical, please let me know

It breaks sites for less than 10.3

If you are on 10.0, 10.1, or 10.2 composer will install the latest then drupal throws errors.

Also to add detail, you should determine what the true minimum is, if you are unsure then I'd recommend 10.3.

Then info.yml and composer should match.
Finally remove the dependency on system entirely, it's not needed.

No one is running drupal without system and it will always match drupal's version.