mirage/mirage: PR #1629: mirage-runtime: avoid lwt 6.0.0 (due to the dune bug)

@b2e2798

Stages:

• 🟠 x86_64-debian-13-4.14
• 🟡 arm64-debian-13-4.14
• 🟠 x86_64-debian-13-5.3
• 🟡 arm64-debian-13-5.3
• 🟠 x86_64-debian-13-5.4
• 🟡 arm64-debian-13-5.4

History:

• 27/01/2026 13:12 🟠 @b2e2798
• 27/01/2026 12:55 ✔️ @baacb37 (59m59s)