removed duplicate field

Author: daniel-sanche

owlbot.py

@@ -138,7 +138,6 @@ def update_fixup_scripts(library):
 # ----------------------------------------------------------------------------
 templated_files = common.py_library(
     samples=False,  # set to True only if there are samples
-    system_test_python_versions=["3.7"],
     unit_test_external_dependencies=["aiounittest", "six", "freezegun"],
     system_test_external_dependencies=["pytest-asyncio", "six"],
     microgenerator=True,