Fix version. refs #12108

Author: OskarStark

components/filesystem.rst

@@ -289,7 +289,7 @@ exception on failure::
     // returns a path like : /tmp/prefix_wyjgtF.png
     $filesystem->tempnam('/tmp', 'prefix_', '.png');
 
-.. versionadded:: 4.4
+.. versionadded:: 5.1
 
     The option to set a suffix in  ``tempnam()`` was introduced in Symfony 4.4.