[Security] Bump nokogiri from 1.8.5 to 1.10.3

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.8.5 to 1.10.3. **This update includes security fixes.**
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/master/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.8.5...v1.10.3)

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

Gemfile.lock

@@ -154,14 +154,14 @@ GEM
     memory_profiler (0.9.10)
     method_source (0.9.0)
     mini_mime (1.0.0)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.4.0)
     minitest (5.11.3)
     multi_xml (0.6.0)
     multipart-post (2.0.0)
     nenv (0.3.0)
     nio4r (2.2.0)
-    nokogiri (1.8.5)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.10.3)
+      mini_portile2 (~> 2.4.0)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)