devel/forge: Update to 0.3.0

• Add some ports to {BUILD|RUN}_DEPENDS. Currently they are indirect dependency of this port and adding them to {BUILD|RUN}_DEPENDS doesn't take any effect right now. But upstream specifies them as dependency. Futhermore there are signs that dependency between the ports that this port requires may change in the near future. And if it really happens it may result in the issue that required port is split from indirect dependency. So it is also intended as safekeeping.
• Adjust version range of dependency.
• Mark MAKE_JOBS_UNSAFE as parallel build fails if Emacs is built with native compilation enabled.

ChangeLog: https://github.com/magit/forge/blob/v0.3.0/CHANGELOG
Differential Revision: https://reviews.freebsd.org/D32503