bump pytest to 7 (#1546)

* bump pytest

* downgrade pytest-cov

Author: dulmandakh

setup.py

@@ -45,9 +45,9 @@ def run_tests(self):
 
 
 tests_require = [
-    "pytest>=6,<7",
-    "pytest-benchmark>=3.4,<4",
-    "pytest-cov>=3,<4",
+    "pytest>=7,<8",
+    "pytest-benchmark>=4,<5",
+    "pytest-cov>=4,<5",
     "pytest-mock>=3,<4",
     "pytest-asyncio>=0.16,<2",
     "snapshottest>=0.6,<1",