Update list of topics for Symfony 7

[ThomasBerends]

I'll be doing this on tomorrow. Just keeping a little list here since the Symfony 7 certification just got released.

New:
Controllers -> Argument value resolvers
Dependency Injection -> Service decoration
Dependency Injection -> Service locators
Miscellaneous -> Clock component

Changed:
Routing -> Configuration (only YAML and PHP attributes)
Templating with Twig -> Twig syntax up to 3.8 version
Forms -> Form types (built-in and custom)
Dependency Injection -> Services registration (only with YAML and PHP attributes)
Security -> Authenticators, Passports and Badges

Also, my boss bought a voucher for me, so I'll be doing the exam at some point 🎉