markdown: Bump merman version (#62236)

bump merman to 0.7 (with patch for multibyte chars)

---

Release Notes:

- N/A or Added/Fixed/Improved ...
c305d68c01Cameron Mcloughlin committed on 8/5/2026, 8:11:33 PM· committed by GitHubparent8c25931
2 files changedLine totals unavailable