minor #33154 Parameter type leftovers (derrabus)

This PR was merged into the 5.0-dev branch.

Discussion
----------

Parameter type leftovers

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #32179
| License       | MIT
| Doc PR        | N/A

Commits
-------

34eda04866 Added more parameter type declarations.

Author: nicolas-grekas

Adapter/ExtLdap/Query.php

@@ -153,7 +153,7 @@ public function execute()
      *
      * @internal
      */
-    public function getResource($idx = 0)
+    public function getResource(int $idx = 0)
     {
         if (null === $this->results || $idx >= \count($this->results)) {
             return null;

Security/LdapUserProvider.php

@@ -146,7 +146,7 @@ public function supportsClass(string $class)
      *
      * @return LdapUser
      */
-    protected function loadUser($username, Entry $entry)
+    protected function loadUser(string $username, Entry $entry)
     {
         $password = null;
         $extraFields = [];