Automated fix by dependabot.
This isn't that important as this directory isn't included in the released Matomo build, but just used for tests.
Instead all those dependencies should be updated sometime at once: #14549
@Findus23 Would it make sense to just merge this PR now and gradually update dependencies?
The CI test failed for PHP 5, not PHP 7.
The library you updated is only used for screenshot testing, which is the build running on PHP 5 only. But that shouldn't be caused by this update. So guess it wouldn't harm to merge that :man_shrugging: