Log Message:
ruby-nokogiri: update to 1.10.8.

Upstream changelog (from CHANGELOG.md):

## 1.10.8 / 2020-02-10

### Security

[MRI] Pulled in upstream patch from libxml that addresses CVE-2020-7595.
Full details are available in \ 
[#1992](https://github.com/sparklemotion/nokogiri/issues/1992).
Note that this patch is not yet (as of 2020-02-10) in an upstream release of libxml.