Remove mock dependency (#249)

requirements_test.txt

@@ -1,4 +1,3 @@
-mock==4.0.3
 coverage==7.5.1
 black==24.4.2
 flake8==7.0.0

tests.py

@@ -1,6 +1,7 @@
 import datetime
 import unittest
 import os.path
+from unittest.mock import patch
 import uuid
 
 import freezegun
@@ -9,7 +10,6 @@
 import boto3
 from botocore.exceptions import ParamValidationError
 from botocore.stub import Stubber
-from mock import patch
 from envs import env
 import requests
 import requests_mock