fix(visitor): set type of template packs

Author: wu-vincent

src/dwarf2cpp/visitor.py

@@ -686,6 +686,7 @@ def visit_GNU_template_parameter_pack(self, die: DWARFDie) -> None:
 
         if parameters:
             param.parameters = parameters
+            param.type = pack_type
 
         self._cache[die.offset] = param