Update pyproject.toml to indicate that SQLAlchemy version should be < 2.0

pyproject.toml

@@ -13,7 +13,7 @@ requires = [
     "click>=7.1",
     "geopandas>= 0.8",
     "pyyaml>= 5.3",
-    "sqlalchemy>= 1.4",
+    "sqlalchemy>= 2.0",
 ]
 requires-python=">= 3.6"