mirage/mirage-skeleton: PR #420: Bump ocamlformat version

@01b3663

Stages:

• ❌ x86_64-debian-13-4.14 (2m26s)
• ❌ arm64-debian-13-4.14 (1m06s)
• ❌ x86_64-debian-13-5.3 (2m18s)
• ❌ arm64-debian-13-5.3 (2m06s)
• ❌ x86_64-debian-13-5.4 (2m16s)
• ❌ arm64-debian-13-5.4 (40s)

History:

• 27/03/2026 17:37 ❌ @01b3663 (7m58s)