CAMEL-21892 Added fix for Stopped producer in DefaultProducerCache.la…

[lantzen]

…stUsedProducer

Description

We have found that the lastUsedProducer field in org.apache.camel.support.cache.DefaultProducerCache may reference a stopped producer that case a java.util.concurrent.RejectedExecutionException if re-used after stop/start of a route where it is used.

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[davsclaus]

Yes this would be good to backport to the LTS branches