Updated mediawiki/extensions
Project: mediawiki/extensions/Thanks  dfb639af3e3ceb0528b3bace6d2f365a393bb0b7

Call getAlphadecimal() directly

Relying on UUID::__toString() now triggers a notice, causing
unrelated patches to fail. This patch addresses the issue.

Change-Id: Ia94826a0e600adf8afd5908af75772b596ab8d0a