[5.x] Fix RedisQueue::later() never passing the delay to the payload

[lazerg]

The version guard added in #1798 compares Application::class, which is the class-name string, instead of Application::VERSION. version_compare() never reads that as a version above 12.11.0, so the condition is false on every Laravel version and $delay is never forwarded to createPayload().

Scheduling still works, since the delay is applied through enqueueUsing()/laterRaw(), but payload['delay'] stays null, so a failed delayed job loses its own delay as the retry fallback and drops back to the supervisor's backoff.

Added a test in QueueProcessingTest asserting the delay reaches the stored payload. It fails on the current 5.x branch and is skipped below Laravel 12.11, where createPayload() has no delay argument.

Fixes #1809