Stop testing with outdated phpunit-bridge version
Stop testing with outdated phpunit-bridge version

Refs https://github.com/sonata-project/dev-kit/issues/216
This should have been done when dropping support for Symfony < 2.8

sonata-project/SonataDoctrinePhpcrAdminBundle,sonata-project/SonataDoctrinePhpcrAdminBundle,sonata-project/SonataDoctrinePhpcrAdminBundle