BF: ignore DeprecationWarning within dateutil which triggers while considering the next listed warning

Author: yarikoptic

tox.ini

@@ -62,6 +62,7 @@ filterwarnings =
     ignore:the imp module is deprecated:DeprecationWarning
     ignore:`Unit` has been deprecated:DeprecationWarning:humanize
     ignore:The distutils package is deprecated:DeprecationWarning:joblib
+    ignore:datetime.datetime.utcfromtimestamp\(\) is deprecated.*:DeprecationWarning:dateutil
     ignore:.*Value with data type .* is being converted:hdmf.build.warnings.DtypeConversionWarning
     ignore:.*find_spec\(\) not found:ImportWarning
     ignore:'cgi' is deprecated:DeprecationWarning:botocore