downstream: pyparsing: fix using deprecated aliases

Deprecated since pyparsing 3.0 and produce runtime warnings. New
function work exactly the same, except their name is pep8 compatible.

src/ifcopenshell-python/ifcopenshell/express/rule_compiler.py

@@ -263,7 +263,7 @@ context_class = context
 
 class codegen_rule:
     def __init__(self, pattern, fn):
-        self.pattern = tuple(rule.parseString(pattern))
+        self.pattern = tuple(rule.parse_string(pattern))
         self.fn = fn
         if not hasattr(codegen_rule, "all_rules"):
             codegen_rule.all_rules = []