Add hook to do postN releases

Turns out I did a booboo which was predictable, and if we want to
track the versioning of uap-core we can't just start diverging.

post-releases provide a path forwards, but was not initially
predicted. Special case the existing stable releases in the script,
might do something smarter eventually if necessary but...

ua-parser-builtins/hatch_build.py

@@ -23,6 +23,9 @@ def update(self, metadata: dict[str, Any]) -> None:
                 }
             },
         )
+        if v in ("0.15.0", "0.16.0", "0.18.0"):
+            v = f"{v}.post1"
+
         metadata["version"] = v