Update Encryption.php

Author: Rotzbua

src/Encryption.php

@@ -106,7 +106,7 @@ public static function deterministicEncrypt(
         $userJwk = new JWK([
             'kty' => 'EC',
             'crv' => 'P-256',
-            'x' => Base64Url::encode($userPublicKeyObjectX),
+            'x' => Base64UrlSafe::encode($userPublicKeyObjectX),
             'y' => Base64Url::encode($userPublicKeyObjectY),
         ]);