Revert bump in rufus-scheduler

Somehow `bundle install` with an update to Sidekiq-cron caused
rufus-scheduler to be bumped, when it doesn't appear absolutely
necessary.

Closes #25160

Gemfile.lock

@@ -614,8 +614,7 @@ GEM
     rubyntlm (0.5.2)
     rubypants (0.2.0)
     rubyzip (1.2.0)
-    rufus-scheduler (3.3.0)
-      tzinfo
+    rufus-scheduler (3.1.10)
     rugged (0.24.0)
     safe_yaml (1.0.4)
     sanitize (2.1.0)