Use unittest.mock from standard library (#222)

Author: bkmgit

pyproject.toml

@@ -20,7 +20,6 @@ beautifulsoup4 = "^4.11.1"
 
 [tool.poetry.group.dev.dependencies]
 lxml = "^4.9.2"
-mock = "^5.0.1"
 pytest = "^7.2.1"
 black = "^23.3.0"
 isort = "^5.12.0"

test/test_parser.py

@@ -2,9 +2,9 @@
 import re
 import sys
 from unittest import TestCase
+from unittest import mock
 
 import bs4
-import mock
 from bs4 import BeautifulSoup
 
 from mf2py import Parser