Merge pull request #1673 from coderdojo-japan/dependabot/bundler/nokogiri-1.18.8

Bump nokogiri from 1.18.4 to 1.18.8

Author: yasulab

Gemfile.lock

@@ -298,7 +298,7 @@ GEM
     net-smtp (0.5.1)
       net-protocol
     nio4r (2.7.4)
-    nokogiri (1.18.4)
+    nokogiri (1.18.8)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     observer (0.1.2)