Bump nokogiri from 1.13.1 to 1.18.8 in /spec/rails7/dummy

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.1 to 1.18.8.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.13.1...v1.18.8)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-version: 1.18.8
  dependency-type: indirect
...

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

Author: dependabot[bot]

spec/rails7/dummy/Gemfile.lock

@@ -130,14 +130,14 @@ GEM
       net-protocol
       timeout
     nio4r (2.5.8)
-    nokogiri (1.13.1-x86_64-darwin)
+    nokogiri (1.18.8-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.13.1-x86_64-linux)
+    nokogiri (1.18.8-x86_64-linux-gnu)
       racc (~> 1.4)
     public_suffix (4.0.6)
     puma (5.6.4)
       nio4r (~> 2.0)
-    racc (1.6.0)
+    racc (1.8.1)
     rack (2.2.3.1)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)