minor #36791 [FrameworkBundle] fix stringable annotation (nicolas-gre…

…kas)

This PR was submitted for the master branch but it was merged into the 4.4 branch instead.

Discussion
----------

[FrameworkBundle] fix stringable annotation

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

Commits
-------

65e6812 [FrameworkBundle] fix stringable annotation

src/Symfony/Bundle/FrameworkBundle/Secrets/SodiumVault.php

@@ -28,8 +28,8 @@ class SodiumVault extends AbstractVault implements EnvVarLoaderInterface
     private $secretsDir;
 
     /**
-     * @param string|object|null $decryptionKey A string or a stringable object that defines the private key to use to decrypt the vault
-     *                                          or null to store generated keys in the provided $secretsDir
+     * @param string|\Stringable|null $decryptionKey A string or a stringable object that defines the private key to use to decrypt the vault
+     *                                               or null to store generated keys in the provided $secretsDir
      */
     public function __construct(string $secretsDir, $decryptionKey = null)
     {