From 409 warnings down to 52 warnings.

By closing unclosed database connections.

Refs #2614

tests/test_api_write.py

@@ -17,6 +17,8 @@ def ds_write(tmp_path_factory):
         db.execute(
             "create table docs (id integer primary key, title text, score float, age integer)"
         )
+    db1.close()
+    db2.close()
     ds = Datasette([db_path], immutables=[db_path_immutable])
     ds.root_enabled = True
     yield ds