Updated mediawiki/extensions
Project: mediawiki/extensions/DonationInterface  31a9ac57d285ed1e399e23a9073499e56d4a3fcc

Load the phpunit.xml we have sitting in tests/

No point having it there if we don't use it - not loading it causes the code
coverage reports to be for the entirety of core...

Change-Id: I60d889dc7dc17e41d4dae6cd56a6bcd47097875b