composer.json: exclude graphql-php 14.0.2 which breaks the tests
composer.json: exclude graphql-php 14.0.2 which breaks the tests

Temporarily until we figure if this is expected for a minor
release or not.

See also https://github.com/webonyx/graphql-php/pull/684#issuecomment-655274309

rebing/graphql-laravel,rebing/graphql-laravel