Update dependency nokogiri to v1.18.6

Gemfile.lock

@@ -63,7 +63,7 @@ GEM
     mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
     newrelic_rpm (8.16.0)
-    nokogiri (1.18.5)
+    nokogiri (1.18.6)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     options (2.3.2)