Changed Improved reliability filtering-rule list updates on Unix systems.

Fixed Occasional client information lookup failures that could lead to the DNS server getting stuck (#6006).

bufio.Scanner: token too long and other errors when trying to add filtering-rule lists with lines over 1024 bytes long or containing cosmetic rules (#6003).

Removed Default exposure of the non-standard ports 784 and 8853 for DNS-over-QUIC in the Dockerfile.