v1.6.0-mas-fixed

Fix MAS signing - remove --options runtime flag (#14)

* Add unique-slug@5.0.0 to package-lock.json

* Add explicit PKG installer signing for MAS builds

* Fix MAS signing: Remove --options runtime flag

The --options runtime flag causes codesign to add the
com.apple.developer.team-identifier entitlement, which is
not in the MAS provisioning profile. This flag is only for
Developer ID distribution, not Mac App Store builds.

Fixes Transporter validation error 409.

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Co-authored-by: Ian Miller <ian@wildfire-corp.com>