On composer.json there is:

     "behat/behat": "2.5.*",

https://github.com/ezsystems/ezpublish-community/blob/master/composer.json#L52

This will get the Behat/Gherkin 2.2.9

     "behat/gherkin": "~2.2.9"

https://packagist.org/packages/behat/behat#v2.5.0
AFAIK "~" will install the highest version of last digit, so it will be stuck with 2.2.9.

And the commit needed is:
https://github.com/MLoureiro/Gherkin/commit/29c1fb8ad40d1d011c59784e5292617f0941662a

And @stov says it will be on 2.3.5 release:
https://github.com/Behat/Gherkin/pull/57

Should the version be changed to "2.5.*@dev", or somehow add the fix manualy?