PROJ_jll v900.100 breaks (online?) transformation

[evetion]

In v1.0 with the old PROJ_jll this worked fine:

julia> Proj.enable_network!()
julia> trans = Proj.Transformation("EPSG:4326", "EPSG:4326+3855")  # ellipsoid to egm2008 height
julia> trans(0,0,0)
(0.0, 0.0, -17.0154953)

In the new _jll I get (0,0,0), without any errors. Looking at the projinfo output, it seems it skips all pipelines requiring (online) vertical grid transform data and arrives at the last noop operation.

[evetion]

This one does work:

trans = Proj.Transformation("EPSG:4979", "EPSG:3855")

[evetion]

I think this is at the source of the issue: OSGeo/PROJ#3119

[visr]

Ah yes, that looks like the same reason I needed to update some of the tests in #70.

[visr]

I think this can be closed, right? PROJ behavior changed, not much to do here.

[evetion]

We could place a warning in the README to pin PROJ versions? As the API might not break, but your results might suddenly change? I dislike this behaviour.

[visr]

Yeah it might be a good idea to mention that if transformations need to stay exactly the same, users should fix the PROJ_jll version.