Change version of GPAD output from 1.2 to something else that's more appropriate

[kltm]

Currently, the GPAD output from minerva's gpad pipeline (that is technically publicly available in products/upstream_and_raw_data) looks like:

!gpa-version: 1.1
!collation date: 2024-07-03
!collated from production models in https://github.com/geneontology/noctua-models/ where col1 matches fb; special rules for MGI (https://github.com/geneontology/pipeline/issues/313)

However, the actual output does not conform to a GPAD 1.1 spec, as there is none. As well, it does not conform to any public spec. For people making parsers or using these files, like @alexsign and MGI, we'd like to indicate that this pseudo-internal format is not really conforming to anything.

Noting that this is in collate-gpads.pl, so it's trivial to change.