sysutils/superfile: update to 1.1.3

 - install as spf in addition to superfile as that seems to be the
   author's preferred command name
 - bump PORTEPOCH following update from development state to release;
   while normally not necessary, Go's versioning conventions make pkg
   think the version went backwards with this update.

Changelog: https://github.com/yorukot/superfile/releases/tag/v1.1.3