Fix warnings raised by incompatibilities with SQLAlchemy 2.x

I believe this should mean we are compatible for the upgrade with this
library.

.cookiecutter/includes/tox/setenv

@@ -0,0 +1 @@
+SQLALCHEMY_WARN_20=1

src/data_tasks/sql_query.py

@@ -33,13 +33,10 @@ def execute(self, connection: Connection, dry_run=False, parameters=None):
         """Execute this query in the given session."""
 
         with self.timing.time_it():
-            if not parameters:
-                parameters = {}
-
             if dry_run:
                 return
 
-            cursor = connection.execute(sa.text(self.text), **parameters)
+            cursor = connection.execute(sa.text(self.text), parameters or {})
             if cursor.returns_rows:
                 # pylint:disable=protected-access
                 self.columns = cursor._metadata.keys

tests/unit/data_tasks/sql_query_test.py

@@ -70,8 +70,7 @@ def assert_query_null_pre_execute(self, query):
 
     @fixture
     def connection(self, db_session):
-        with db_session.bind.connect() as connection:
-            yield connection
+        return db_session.bind
 
     @fixture
     def query(self):

tox.ini

@@ -16,6 +16,7 @@ setenv =
     OBJC_DISABLE_INITIALIZE_FORK_SAFETY = YES
     dev: DATABASE_URL = {env:DATABASE_URL:postgresql://postgres@localhost:5439/postgres}
     tests,functests: TEST_DATABASE_URL = {env:TEST_DATABASE_URL:postgresql://postgres@localhost:5439/data_tasks_test}
+    SQLALCHEMY_WARN_20=1
 passenv =
     HOME
     PYTEST_ADDOPTS