Bump nokogiri from 1.10.7 to 1.10.8

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.10.7 to 1.10.8.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.10.7...v1.10.8)

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

Gemfile.lock

@@ -85,9 +85,9 @@ GEM
     minitest (5.13.0)
     nio4r (2.5.2)
     nio4r (2.5.2-java)
-    nokogiri (1.10.7)
+    nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
-    nokogiri (1.10.7-java)
+    nokogiri (1.10.8-java)
     rack (2.0.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)