ports-mgmt/pkg-devel: update to 1.20.99.6

Changes:

• enable netrc support to be compatible with libfetch variable
• enable by default all supported kind of authentication for curl
• Fix duplicated rquery
• Make missing plugins non fatal (needed for smooth packagekit support)
• Do not complain about Last-Modified head if the fetch was a failure
• Support for jobs cancellation (needed for packagekit support)
• update sqlite3 to 3.43.0
• update lua to 5.4.6
• plug plenty of memory leaks
• improve debug output in particular for sql statements
• exclude locked package early from autoremove candidates
• fix very slow orphan test computation consuming 100% of CPU in autoremove