minor #60148 Remove non-final readonly classes (nicolas-grekas)

This PR was merged into the 7.3 branch.

Discussion
----------

Remove non-final readonly classes

| Q             | A
| ------------- | ---
| Branch?       | 7.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

Those are just annoying from a maintainer PoV, without providing us any extra maintenance flexibility (quite the contrary).

Commits
-------

bbba700c0b1 Remove non-final readonly classes

Author: fabpot

Attribute/IsGrantedContext.php

@@ -17,12 +17,12 @@
 use Symfony\Component\Security\Core\Authorization\Voter\AuthenticatedVoter;
 use Symfony\Component\Security\Core\User\UserInterface;
 
-readonly class IsGrantedContext implements AuthorizationCheckerInterface
+class IsGrantedContext implements AuthorizationCheckerInterface
 {
     public function __construct(
-        public TokenInterface $token,
-        public ?UserInterface $user,
-        private AuthorizationCheckerInterface $authorizationChecker,
+        public readonly TokenInterface $token,
+        public readonly ?UserInterface $user,
+        private readonly AuthorizationCheckerInterface $authorizationChecker,
     ) {
     }