Log Message:
devel/protobuf-c: Belated revbump for update of protobuf

In mid-February, protobuf was updated from 25.2 to 25.3.  Apparently
and arguably, this was a minor update.  The shlib version changed from
25.2.0 to 25.3.0.  However, due to either an upstream bug or upstream
not following norms, there is no .25 symlink, and depending packages
encode the full version.  Thus, this was an ABI change.