Log Message:
ruby-nokogiri: update to 1.8.5.

Upstream changes (from CHANGELOG.md):

# 1.8.5 / 2018-10-04

## Security Notes

[MRI] Pulled in upstream patches from libxml2 that address CVE-2018-14404
and CVE-2018-14567. Full details are available in [#1785]
(https://github.com/sparklemotion/nokogiri/issues/1785).
Note that these patches are not yet (as of 2018-10-04) in an upstream
release of libxml2.

## Bug fixes

* [MRI] Fix regression in installation when building against system
  libraries, where some systems would not be able to find libxml2 or
  libxslt when present. (Regression introduced in v1.8.3.) [#1722]
* [JRuby] Fix node reparenting when the destination doc is empty. [#1773]