SNOW-2333702 Fix types for DictCursor

[sfc-gh-bchinn]

Port PR: https://github.com/snowflakedb/Stored-Proc-Python-Connector/pull/225

On main, the following code shows the following mypy errors:

from snowflake.connector import connect, DictCursor

def main() -> None:
    conn = connect()

    c1 = conn.cursor()
    print([row[0] for row in c1.fetchall()])

    c2: DictCursor = conn.cursor(DictCursor)
    print([row["COL1"] for row in c2.fetchall()])

• error: Incompatible types in assignment (expression has type "SnowflakeCursor", variable has type "DictCursor") [assignment]
• error: No overload variant of "__getitem__" of "tuple" matches argument type "str" [call-overload]

This change fixes both errors.

[sfc-gh-bchinn]

• Typecheck cursor.py #2550
• SNOW-2333702 Fix types for DictCursor #2532 👈 (View in Graphite)
• Fix get_results_from_sfqid with DictCursor + multi statements #2531
• main

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