Release rescached v4.4.2 (2023-11-10)

* all: remove loading system hosts file::

  Loading and caching system hosts file (for example, /etc/hosts in
  POSIX) will leaks internal hosts if the rescached server is open to
  public.

  The system hosts file are handled by nssswitch.conf "files" internally
  so no need to loading it.

* cmd/resolver: replace "math/rand" with "crypto/rand"::

  The random number from "math/rand" is predictable if the seed is
  known. Even though the random number here is only for generating
  unique request ID, we still need to prevent this by using more secure
  random number.
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