ports-mgmt/pkg: update to 1.20.7

Changes from 1.20.6 to 1.20.7
- improve sql traces in debug mode
- fix autoremove issue leading to 100% of CPU consumed almost forever
- don't complain about Last-modified http header being absent in case the DL
  failed
- plug memory leaks in pkg autoremove
- fix build with lld >= 17