Use Go 1.23 as default version for port builds

Summary:
Go 1.23 has been released, but FreeBSD is still configured
to use 1.21 by default.

Test Plan:
Deployed on WindRiver.

Used to build Medusa.

Reviewers: DorianWinty

Reviewed By: DorianWinty

Differential Revision: https://devcentral.nasqueron.org/D3485