Update dependency coverage to v7

setup.py

@@ -72,7 +72,7 @@ def run(self):
     test_suite='tests',
     tests_require=[
         'codecov>=2.0.3,<3.0.0',
-        'coverage>=4.0.3,<5.0.0',
+        'coverage>=7.5.2,<7.6.0',
         'Sphinx>=1.4.1,<2.0.0',
         'tox>=2.3.1,<3.0.0',
         'virtualenv>=15.0.1,<16.0.0'