remove pgdata dependency

[smnorris]

I would like to retire this package. Much of the db interaction can now be done with psycopy2 built in methods.
Not a priority at the moment though.

[smnorris]

Note that loading complex data can bail due to smnorris/pgdata#21.
Easy fix but I'd prefer to retire the package.
If data load fails due to presence of multisurface records, manually run the ogr2ogr command, something like this:

    ogr2ogr \
        -f PostgreSQL \
        PG:"host=localhost port=5433 user=postgres dbname=designatedlands password=postgres" \
        -lco OVERWRITE=YES \
        -overwrite \
        -lco SCHEMA=public \
        -nlt PROMOTE_TO_MULTI \
        -nlt CONVERT_TO_LINEAR \
        -nln cef_human_disturbance \
        -sql "SELECT * FROM BC_CEF_Human_Disturb_BTM_2021_merge WHERE CEF_DISTURB_GROUP_RANK IN (1,2,3,4,5,6,7,8,9,10)" \
        source_data/BC_CEF_Human_Disturbance_2021.gdb