fix min deps

Author: blink1073

pyproject.toml

@@ -51,7 +51,7 @@ dev = []
 pip = ["pip>=20.2"]
 gevent = ["gevent>=20.6.0"]
 coverage = [
-    "pytest-cov>=2.10.0",
+    "pytest-cov>=4.0.0",
     "coverage[toml]>=5,<=7.10.6"
 ]
 mockupdb = [