fix(delayed_job): fix tests for DJ 4.2.0 (#2816)

Author: solnic

sentry-delayed_job/spec/sentry/delayed_job_spec.rb

@@ -181,6 +181,15 @@ def do_nothing_with_args(a)
     require "active_job"
     require "sentry-rails"
 
+    # delayed_job 4.2.0 adapter references AbstractAdapter which was removed in newer ActiveJob versions
+    # Define it as a compatibility shim
+    module ActiveJob
+      module QueueAdapters
+        class AbstractAdapter
+        end
+      end
+    end
+
     class ReportingJob < ActiveJob::Base
       self.queue_adapter = :delayed_job