cache_redis Connection pool blocking

[ChayCZM]

Publish a tif using GDAL data source, use redis as cache, and the request is blocked after a period of time. The location problem code is in the "cache _ redis.c" _mapcache_cache_redis_get() function. Is the resource returned by "_redis_get_connection" forgotten to be released? because it quickly reaches the default threshold of 1024.