comms/predict: update to 2.3.1

[upstream changes]
Release 2.3.1:
By John A. Magliacane <kd2bd@amsat.org> (05-Aug-2023):

• Fixed a bug that caused the "Upcoming Passes" list in Multi-Satellite tracking mode to occasionally produce erroneous results if one or more satellites in the database had decayed from orbit.

• The Vocalizer feature was modified to prevent it from being executed by a user keyboard command until after the current speech announcement has terminated.

• The earthtrack compilation script was modified to prevent the "undefined reference" errors some users experienced during the linking phase of the compilation process.

• All references to www.celestrak.com in the "kepupdate" script have been changed to celestrak.org due to the site's name change.

• Several other small coding changes were made.

[db changes]

• Upstream does not come with a proper build infrastructure hence build is done in our port Makefile now instead of copied Makefile.
• portlint and portfmt ran clearly as did poudriere.
• Added earthtrack, kepupdate and moontracker binaries but did not add gsat which should be a separate port IMO

PR: 277986
Reported by: Andrey Korobkov <alster@vinterdalen.se>