CI: remove pip3 global-option flags (#2154)

Remove global options from GDAL installation command.

Author: tomkralidis

.github/workflows/main.yml

@@ -127,7 +127,7 @@ jobs:
         pip3 install -r requirements-manager.txt
         pip3 install -r requirements-django.txt
         pip3 install .
-        pip3 install --global-option=build_ext --global-option="-I/usr/include/gdal" GDAL==`gdal-config --version`
+        pip3 install GDAL==`gdal-config --version`
     - name: setup test data ⚙️
       run: |
         python3 tests/load_es_data.py tests/data/ne_110m_populated_places_simple.geojson geonameid