SA20: Adjust compatible SQLAlchemy versions: <2.1

Author: amotl

setup.py

@@ -60,7 +60,7 @@ def read(path):
     },
     install_requires=['urllib3>=1.9,<2'],
     extras_require=dict(
-        sqlalchemy=['sqlalchemy>=1.0,<1.5',
+        sqlalchemy=['sqlalchemy>=1.0,<2.1',
                     'geojson>=2.5.0,<3',
                     'backports.zoneinfo<1; python_version<"3.9"'],
         test=['tox>=3,<4',