Bump nokogiri from 1.10.7 to 1.10.9

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.10.7 to 1.10.9.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/v1.10.9/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.10.7...v1.10.9)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -209,7 +209,7 @@ GEM
     net-http-pipeline (1.0.1)
     netrc (0.11.0)
     nio4r (2.5.2)
-    nokogiri (1.10.7)
+    nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     os (0.9.6)
     parallel (1.19.1)