Webauthn\Serveris removed and there is no replacement.
spomky-labs/cbor-phpminimal version is now
spomky-labs/cbor-bundleminimal version is now
symfonycomponents minimal version is now
symfony/psr-http-message-bridgeminimal version is now
sensio/framework-extra-bundleis not required anymore, the associated configuration may become useless if you do not use this bundle in your project.
v4.0. When done, execute