Use PYTHON3_VERSION_MIN

Author: cdce8p

mypy/test/helpers.py

@@ -261,7 +261,7 @@ def testfile_pyversion(path: str) -> tuple[int, int]:
     if m := re.search(r"python3([0-9]+)\.test$", path):
         # For older unsupported version like python38,
         # default to that earliest supported version.
-        return max((3, int(m.group(1))), defaults.PYTHON3_VERSION)
+        return max((3, int(m.group(1))), defaults.PYTHON3_VERSION_MIN)
     else:
         return defaults.PYTHON3_VERSION