Fix PHP 8.4 deprecations (#163)

* Fix PHP 8.4 deprecations

* Test against PHP 8.4

* Change min PHP requirement to 7.1.x

Fix phpdoc for JsonSchena::setType() (#154)

The type definition in `setType` method can be updated as the property itself accepts `string` too

Update CHANGELOG.md

Update CHANGELOG.md

Refresh composer.lock with new dependency (#134)

Patch phpunit to allow testing in PHP 8.1 (#131)

Move invalid value exception data to dedicated fields (#128)

Update CHANGELOG.md

Make InvalidRef a critical exception to avoid suppression (#122)

Fail validation on invalid reference exception (#121)