security/doas: Update to 6.2p1

Significant items from https://github.com/slicer69/doas/releases:
doas 6.2p1
* Fixes a crash on Linux systems when a specified user on the
  command line did not match a valid entry in the doas.conf file.
  In the past, doas would first try to find an exact username match
  when the "-u" flag was used and, if one could not be found, it
  would try to find a matching numeric UID.
  Now doas requires that an exact username be specified when
  "-u" is used. This avoids confusion (and, on Linux, fuzzy matches
  when a username begins with a number). This means "doas -u 0" can
  no longer be used to run a command as root, and "duas -u 1000" is
  not ambigious if there is a user with the name "1000" on the system.

doas 6.2
* Group permissions of the original user are now dropped on Linux.
  This prevents the original user's group access from interfering
  with the target user's owned files. Group permissions were already
  dropped on FreeBSD (and I believe) NetBSD, and this brings doas's
  Linux behaviour into line with the other systems.
* Fixed a couple of compiler warnings that get rid of either unneeded
  variables or introduce sanity checks on return functions.
  This should make doas more secure, across platforms/compilers.

doas 6.1p1
* ported to illumos, added support for SmartOS and
  OpenIndiana.
* Better pkgsrc integration.


(ng0)