Bump nokogiri from 1.11.3 to 1.11.4 in /example_app

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.11.3 to 1.11.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.11.3...v1.11.4)

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

Author: dependabot[bot]

example_app/Gemfile.lock

@@ -32,7 +32,7 @@ GEM
     multipart-post (2.0.0)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    nokogiri (1.11.3)
+    nokogiri (1.11.4)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
     octokit (4.7.0)