ports-mgmt/pkg: update to 2.1.2

Changes:

• fix an important regression introduced in 2.1.1
• more performance improvement on pkg add

Because of a bad merge between the main and the release branch of pkg
some commits were missed and a regression was introduced in pkg 2.1.1

It results in some packages dependending on themselves which breaks
early the various bulks.

Those packages built with 2.1.1 needs to be recreated with 2.1.2

PR: 286130