Update Gemfile
For a particular version of mediawiki_selenium that works with the current Firefox. Change-Id: I20a4c29c5fcace04bf78b969b821f971e78a5cac
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For a particular version of mediawiki_selenium that works with the current Firefox. Change-Id: I20a4c29c5fcace04bf78b969b821f971e78a5cac