Remove sqlean.py support (#772)

Closes #771, refs #769

tests/test_gis.py

@@ -6,11 +6,6 @@ from sqlite_utils.cli import cli
 from sqlite_utils.db import Database
 from sqlite_utils.utils import find_spatialite, sqlite3
 
-try:
-    import sqlean  # type: ignore[import-not-found]
-except ImportError:
-    sqlean = None
-
 
 pytestmark = [
     pytest.mark.skipif(
@@ -20,9 +15,6 @@ pytestmark = [
         not hasattr(sqlite3.Connection, "enable_load_extension"),
         reason="sqlite3.Connection missing enable_load_extension",
     ),
-    pytest.mark.skipif(
-        sqlean is not None, reason="sqlean.py is not compatible with SpatiaLite"
-    ),
 ]