Bump nokogiri from 1.18.3 to 1.18.4 in /examples/stacks/rails/blog

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.18.3 to 1.18.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.18.3...v1.18.4)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: indirect
...

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

Author: dependabot[bot]

examples/stacks/rails/blog/Gemfile.lock

@@ -129,11 +129,11 @@ GEM
     net-smtp (0.5.0)
       net-protocol
     nio4r (2.7.3)
-    nokogiri (1.18.3-arm64-darwin)
+    nokogiri (1.18.4-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.18.3-x86_64-darwin)
+    nokogiri (1.18.4-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.18.3-x86_64-linux-gnu)
+    nokogiri (1.18.4-x86_64-linux-gnu)
       racc (~> 1.4)
     psych (5.1.2)
       stringio