Fixed #18065: ensure that private_key_bits is always an int.

Author: smarsching

app/Http/Requests/SettingsSamlRequest.php

@@ -109,7 +109,7 @@ public function withValidator($validator)
                 ];
 
                 $pkey = openssl_pkey_new([
-                    'private_key_bits' => config('app.saml_key_size'),
+                    'private_key_bits' => (int) config('app.saml_key_size'),
                     'private_key_type' => OPENSSL_KEYTYPE_RSA,
                 ]);