Log Message:
geography/gdal-lib: Increase API_DEPENDS

I'm really not clear on API changes, or on what gdal version a
typical/reasonable actually-maintained program would expect as a
minimum.  I am picking 3.7.0 as a floor, and thus saying that if you
have installed gdal older than that and want to build something using
it, you should rebuild gdal first.  I expect this to affect zero
actual people; not updating gdal and building other programs doesn't
make sense.

FWIW, no package (other than py-gdal which doesn't count) currently
sets BUILDLINK_API_DEPENDS.gdal-lib.