gems: Upgrade nokogiri to > 1.10.7
As reported in #2669 (closed), the gem Nokogiri should be updated to 1.10.8 or later. In this case the 1.10.9 release was out, so updating it to the latest patch release.
As reported in #2669 (closed), the gem Nokogiri should be updated to 1.10.8 or later. In this case the 1.10.9 release was out, so updating it to the latest patch release.