Merge pull request #1657 from coderdojo-japan/dependabot/bundler/nokogiri-1.18.3

Bump nokogiri from 1.17.2 to 1.18.3

Author: yasulab

Gemfile.lock

@@ -294,7 +294,7 @@ GEM
     net-smtp (0.5.0)
       net-protocol
     nio4r (2.7.4)
-    nokogiri (1.17.2)
+    nokogiri (1.18.3)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     os (1.1.4)