Fix greedy parsing of "freethreaded" as a part of the platform triple (#1021)

Fixes astral-sh/uv#18609

Author: zanieb

generate-version-metadata.py

@@ -19,7 +19,7 @@
         cpython-
         (?P<py>\d+\.\d+\.\d+(?:(?:a|b|rc)\d+)?)(?:\+\d+)?\+
         (?P<tag>\d+)-
-        (?P<triple>[a-z\d_]+-[a-z\d]+(?:-[a-z\d]+)?-[a-z\d_]+)-
+        (?P<triple>[a-z\d_]+-[a-z\d]+-[a-z\d]+(?:-(?:gnu(?:eabi(?:hf)?)?|musl|msvc))?)-
         (?:(?P<build>.+)-)?
         (?P<flavor>[a-z_]+)?
         \.tar\.(?:gz|zst)