[mypyc] Remove unnecessary max call for python version (#12848)

We don't support running on Python 3.5 or lower anymore, so the max call
is unnecessary because the current version will always be greater than
or equal to (3, 6).

Author: pranavrajpal

mypyc/test/test_run.py

@@ -174,11 +174,7 @@ def run_case_step(self, testcase: DataDrivenTestCase, incremental_step: int) ->
         options.use_builtins_fixtures = True
         options.show_traceback = True
         options.strict_optional = True
-        # N.B: We try to (and ought to!) run with the current
-        # version of python, since we are going to link and run
-        # against the current version of python.
-        # But a lot of the tests use type annotations so we can't say it is 3.5.
-        options.python_version = max(sys.version_info[:2], (3, 6))
+        options.python_version = sys.version_info[:2]
         options.export_types = True
         options.preserve_asts = True
         options.incremental = self.separate