Fix compatibility with uuid 1.12

uuid 1.12 introduced the NonNilUuid type, which can, like the Uuid
type, be parsed from a string. The Uuid type now implements
PartialEq<Self> and PartialEq<NonNilUuid>. That breaks type inferrence,
because the compiler now cannot know whether we want to parse a Uuid or
a NonNilUuid.

We thus have to be explicit.

parsers/ChangeLog

@@ -57,6 +57,7 @@ XXXX-YY-ZZ RELEASER <admin@example.com>
         and return simply Option<T> instead of Result<Option<T>> (!497)
       - Add Message::get_best_body_cloned and Message::get_best_subject_cloned
         to clone automatically when performance is not an issue (!497)
+      - Fix compatibility to uuid 1.12
 
 Version 0.21.0:
 2024-07-25 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>