[py] fix text using caplog

need to format the message instead of using the message string with placeholder

Author: titusfortner

py/test/unit/selenium/webdriver/common/cdp_module_fallback_tests.py

@@ -26,4 +26,4 @@ def test_missing_cdp_devtools_version_falls_back(caplog):
     with caplog.at_level(logging.DEBUG, logger="selenium"):
         assert isinstance(import_devtools("will_never_exist"), types.ModuleType)
     # assert the fallback occurred successfully offered up a v{n} option.
-    assert re.match(r"Falling back to loading `devtools`: v\d+", caplog.records[-1].msg) is not None
+    assert re.match(r"Falling back to loading `devtools`: v\d+", caplog.records[-1].getMessage()) is not None