Fix: updates.xml regex only matches target stability block, restore correct SHAs

The Python regex now uses negative lookahead (?:(?!</update>).)*? to
prevent matching across multiple <update> blocks. All channels restored
with correct SHA (0f1cf23a...) matching the v03 stable ZIP.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/release.yml

@@ -314,9 +314,9 @@ jobs:
           with open("updates.xml", "r") as f:
               content = f.read()
 
-          # Build regex to find the <update> block containing this stability tag
-          # Match from <update> to </update> that contains <tag>xml_tag</tag>
-          block_pattern = r"(<update>.*?<tag>" + re.escape(xml_tag) + r"</tag>.*?</update>)"
+          # Build regex to find the specific <update> block for this stability tag
+          # Use negative lookahead to avoid matching across multiple <update> blocks
+          block_pattern = r"(<update>(?:(?!</update>).)*?<tag>" + re.escape(xml_tag) + r"</tag>.*?</update>)"
           match = re.search(block_pattern, content, re.DOTALL)
 
           if not match: