security/gopass: Update to 1.15.5

[ENHANCEMENT] Add internal pager (ov)

Since we have ov on ports (textproc/ov) looking for a possible way to use
ov port instead.
https://github.com/gopasspw/gopass/issues/2507

ChangeLog: https://github.com/gopasspw/gopass/releases/tag/v1.15.5