fixes error in dict_merge when merging list value (#35461)

lib/ansible/module_utils/network/common/utils.py

@@ -284,7 +284,11 @@ def dict_merge(base, other):
             if key in other:
                 item = other.get(key)
                 if item is not None:
+                    try:
                         combined[key] = list(set(chain(value, item)))
+                    except TypeError:
+                        value.extend([i for i in item if i not in value])
+                        combined[key] = value
                 else:
                     combined[key] = item
             else: