Fix "unsubscriptable-object" issue in kyu_2/evaluate_mathematical_expression/evaluate.py

[ikostan]

Value 'tuple' is unsubscriptable

https://codeclimate.com/github/iKostanOrg/codewars/kyu_2/evaluate_mathematical_expression/evaluate.py#issue_6721b1496578ac0001000890

[ikostan]

Value 'tuple' is unsubscriptable New
def check_conditions(strings: list, string: str, temp: str) -> tuple[str, str]:
Severity: CriticalFound in kyu_2/evaluate_mathematical_expression/evaluate.py by pylint

[ikostan]

Emitted when a subscripted value doesn't support subscription (i.e. doesn't define getitem method or class_getitem for a class).