minor #32942 [Ldap] Fix LdapUserProvider signatures (chalasr)

This PR was merged into the 5.0-dev branch.

Discussion
----------

[Ldap] Fix LdapUserProvider signatures

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

920a52ddda [Ldap] Fix signature compat

src/Symfony/Component/Ldap/Security/LdapUserProvider.php

@@ -63,7 +63,7 @@ class LdapUserProvider implements UserProviderInterface
     /**
      * {@inheritdoc}
      */
-    public function loadUserByUsername($username)
+    public function loadUserByUsername(string $username)
     {
         try {
             $this->ldap->bind($this->searchDn, $this->searchPassword);
@@ -112,7 +112,7 @@ class LdapUserProvider implements UserProviderInterface
     /**
      * {@inheritdoc}
      */
-    public function supportsClass($class)
+    public function supportsClass(string $class)
     {
         return LdapUser::class === $class;
     }

src/Symfony/Component/Ldap/composer.json

@@ -21,10 +21,11 @@
         "ext-ldap": "*"
     },
     "require-dev": {
-        "symfony/security-core": "^4.4"
+        "symfony/security-core": "^5.0"
     },
     "conflict": {
-        "symfony/options-resolver": "<4.4"
+        "symfony/options-resolver": "<4.4",
+        "symfony/security-core": "<5"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\Ldap\\": "" },