Add 3.8 block for strategyUpdater

tests/test_strategy_updater.py

@@ -1,8 +1,16 @@
 # pragma pylint: disable=missing-docstring, protected-access, invalid-name
 
+import sys
+
+import pytest
+
 from freqtrade.strategy.strategyupdater import StrategyUpdater
 
 
+if sys.version_info < (3, 9):
+    pytest.skip("StrategyUpdater is not compatible with Python 3.8", allow_module_level=True)
+
+
 def test_strategy_updater(default_conf, caplog) -> None:
     instance_strategy_updater = StrategyUpdater()
     modified_code1 = instance_strategy_updater.update_code("""