[Validator] add deprecation log to class ApcCache (#12665)

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | #12665
| License       | MIT
| Doc PR        | 

This adds depreciation note for the Symfony\Component\Validator\Mapping\Cache\ApcCache class.
Can you replace ApcCache with the fully qualified class name to avoid any confusion with other ApcCache classes in the frameworks?