Simplify project dependencies

Author: dmtucker

pyproject.toml

@@ -32,12 +32,8 @@ requires-python = ">=3.7"
 dependencies = [
     "attrs>=19.0",
     "filelock>=3.0",
-    "pytest>=4.6; python_version<'3.10'",
-    "pytest>=6.2; python_version>='3.10'",
-    "mypy>=0.500; python_version<'3.8'",
-    "mypy>=0.700; python_version>='3.8' and python_version<'3.9'",
-    "mypy>=0.780; python_version>='3.9' and python_version<'3.11'",
-    "mypy>=0.900; python_version>='3.11'",
+    "mypy>=0.50",
+    "pytest>=4.6",
 ]
 
 [project.entry-points.pytest11]