Fix for issue 11049

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | yes
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11049
| License       | MIT
| Doc PR        | 

See the original ticket.
I've added support for the new `Symfony\Component\Validator\Context\ExecutionContextInterface` in `Symfony\Component\Validator\ConstraintValidator`, so the new Validation api can be used.