databases/cego: update 2.39.2 -> 2.39.3

• Small improvement in CegoDbThreadPool. For a better db thread load value calculation, the request queue is no longer locked while waiting for incoming requests. Instead the QUEUEDELAY parameter has been increased to a default value of 200 msec to reduce db thread cpu load while idle. Now the db thread has a good chance to report idle time to the db thread pool.

Submitted by: Bjoern Lemke <lemke@lemke-it.com>