minor #43903 Fix more generic types (derrabus)

This PR was merged into the 5.4 branch.

Discussion
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Fix more generic types

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | N/A
| License       | MIT
| Doc PR        | N/A

Some changes I wanted to push to #42471, but then it got merged already. 😇

Commits
-------

c54d61e9af Fix more generic types

Author: fabpot

Authentication/AuthenticationProviderManager.php

@@ -47,8 +47,8 @@ class AuthenticationProviderManager implements AuthenticationManagerInterface
     private $eventDispatcher;
 
     /**
-     * @param iterable<int, AuthenticationProviderInterface> $providers        An iterable with AuthenticationProviderInterface instances as values
-     * @param bool                                           $eraseCredentials Whether to erase credentials after authentication or not
+     * @param iterable<mixed, AuthenticationProviderInterface> $providers        An iterable with AuthenticationProviderInterface instances as values
+     * @param bool                                             $eraseCredentials Whether to erase credentials after authentication or not
      *
      * @throws \InvalidArgumentException
      */

Authorization/TraceableAccessDecisionManager.php

@@ -26,6 +26,7 @@ class TraceableAccessDecisionManager implements AccessDecisionManagerInterface
 {
     private $manager;
     private $strategy;
+    /** @var iterable<mixed, VoterInterface> */
     private $voters = [];
     private $decisionLog = []; // All decision logs
     private $currentLog = [];  // Logs being filled in
@@ -98,7 +99,7 @@ public function getStrategy(): string
     }
 
     /**
-     * @return iterable<int, VoterInterface>
+     * @return iterable<mixed, VoterInterface>
      */
     public function getVoters(): iterable
     {