[Task] Switch from pygdal to GDAL python bindings

[mradamcox]

Describe the task
The official python bindings from GDAL seem to work exactly the same as the NextGIS pygdal package I've been using, but they have better support for more recent GDAL releases. The install scripts should use that library instead of pygdal.

Completion criteria
Update requirements.txt, recreate prod env with this package.