Drop support for justinrainbow/json-schema:^5

and ComponentValidatorTest:

// This is a valid URI but for v5.2 of justinrainbow/json-schema it
// does not pass validation without a custom constraint for format.
// We pass a custom factory and it should be used.
'href' => 'entity:node/1',

Cant really remove the custom validator there?

JsonSchema\Tool\Validator\UriValidator only supports a fixed set of special urls.

        // RFC 3986: Non-Hierarchical URIs (mailto, data, urn, news)
        $nonHierarchicalPattern = '/^
                (mailto|data|urn|news|tel):          # Only allow known non-hierarchical schemes
                (.+)                                 # Must contain at least one character after scheme
        $/ix';

So that would mean we need to change core/modules/system/tests/modules/sdc_test/components/my-cta/my-cta.component.yml to end up in RelativeReferenceValidator which would mean the type should be uriref or uri-reference.

I can change that in the code, but that would kinda mean if there is components with format: uri those might break?

So not too sure about that part.

How to reproduce:

core/tests/Drupal/Tests/Core/Theme/Component/ComponentValidatorTest.php:257

    $component_validator->setValidator(/*new Validator((new Factory())->setConstraintClass('format', UrlHelperFormatConstraint::class))*/);

it will fail.

Then

core/modules/system/tests/modules/sdc_test/components/my-cta/my-cta.component.yml:19

      format: uri-reference