Updated mediawiki/extensions
Project: mediawiki/extensions/Parsoid  872750d7eeef6b9326be4b05dc4bc53cecf3f877

Bug 57251: Lowercase attributes before sanitization

This avoids dropping them on the floor completely.

We still don't preserve the case of these attributes, but arguably that should
be covered well enough by selser.

Change-Id: Id07eccd94cfe38936e36be7aad8be042fdff7e62