Bump nokogiri from 1.10.5 to 1.10.8 (#2470)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.10.5 to 1.10.8.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.10.5...v1.10.8)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -89,7 +89,7 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.13.0)
     nio4r (2.5.2)
-    nokogiri (1.10.5)
+    nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     parallel (1.18.0)
     parser (2.6.5.0)