comms/kermit: update C-Kermit to version 10.0 Beta.02

The forthcoming new release of C-Kermit, expected "pretty soon", will
be called 10.0 rather than 9.0.305.

The new version number, 10.0, is a change in format. Earlier version
numbers had three parts, e.g. 9.0.304 (major.minor.edit), the new one
follows contemporary two-part convention.