Remove GDAL version restriction

Author: nmaarnio

.github/workflows/tests.yml

@@ -25,7 +25,7 @@ jobs:
           sudo apt-add-repository ppa:ubuntugis/ubuntugis-unstable
           sudo apt-get update
           sudo apt-get install gdal-bin libgdal-dev
-          pip install GDAL==3.4.3 poetry
+          pip install poetry
           poetry install
       - name: Test with pytest
         run: |