graphics/py-fiona: Update to 1.8.17

Changelog:

• 1.8.17 (2020-09-09)
  • To fix issue #952 the fio-cat command no longer cuts feature geometries at the anti-meridian by default.
  • A cut-at-antimeridian option has been added to allow cutting of geometries in a geographic destination coordinate reference system.

• 1.8.16 (2020-09-04)
  • More OGR errors and warnings arising in calls to GDAL C API functions are surfaced (#946).
  • A circular import introduced in some cases in 1.8.15 has been fixed (#945).

• 1.8.15 (2020-09-03)
  • Change shim functions to not return tuples (#942) as a solution for the packaging problem reported in #941.
  • Raise a Python exception when VSIFOpenL fails (#937).