mermaid_render: Update merman to `0.8.0-alpha.5` (#62931)

Release Notes:

- Fixed an issue where labels in mermaid diagrams would not soft-wrap
correctly
ec18126b1dBennet Bo Fenner committed on 8/21/2026, 11:29:58 AM· committed by GitHubparent10b2925
5 files changedLine totals unavailable