Commit message:
```
net-p2p/lidarr: Switch to mono 6.8
Use the most recent mono available (with less bugs, faster)s.
While here, portfmt the reformat Makefile with portfmt.
PR: 259250
Approved by: michiel@vanbaak.eu (maintainer), tbd (mentor)
Differential Revision: https://reviews.freebsd.org/D33000
```