Update gh username mapping

Author: mbellade

_data/contributors-name-mapping.yml

@@ -63,7 +63,7 @@ maesenka: Karel Maesen
 maniksurtani: Manik Surtani
 marko-bekhta: Marko Bekhta
 mathpere: Mathieu Perez
-mbladel: Marco Belladelli
+mbellade: Marco Belladelli
 mbppower: Marcel Barbosa Pinto
 michael-simons: Michael Simons
 mincong-h: Mincong Huang