SNOW-720936: Arrays with nulls return invalid JSON for null values

1. What version of Python are you using?

❯ python --version --version
Python 3.10.9 (main, Dec  6 2022, 18:44:57) [GCC 11.3.0]

2. What operating system and processor architecture are you using?

❯ python -c 'import platform; print(platform.platform())'
Linux-5.15.86-x86_64-with-glibc2.35

3. What are the component versions in the environment (pip freeze)?

❯ poetry show snowflake-sqlalchemy
 name         : snowflake-sqlalchemy
 version      : 1.4.4
 description  : Snowflake SQLAlchemy Dialect

❯ poetry show snowflake-connector-python
 name         : snowflake-connector-python
 version      : 2.9.0
 description  : Snowflake Connector for Python

4. What did you do?

In [19]: import sqlalchemy as sa

In [20]: con = sa.create_engine(...)

In [21]: [(row,)] = con.execute('select array_construct(1,2,null)')

In [22]: row
Out[22]: '[\n  1,\n  2,\n  undefined\n]'

In [23]: import json

In [24]: json.loads(row)

5. What did you expect to see?

   I think I'd expect to see null (and then None from the result of the parse done by json.loads). null is a valid JSON value while undefined is not.

6. Can you set logging to DEBUG and collect the logs?

   I don't think doing this helps, as the query succeeds.