[PROJ] PROJ 8.0.1RC1 and PROJ-data 1.6RC1

[Kristian Evers]

> 
> The checksums will be different, tar is easily reproducible, although
> pristine-tar does a reasonable job. The checksums can be updated along
> with the tarballs.
> 

Yes, locally on the OSGeo server but I can’t update them in conda for instance.
Oh well, not a big deal considering that we are talking release candidates. I’ll sort
it out.

/Kristian