MaintenanceMode 17.2.0 and 18.2.0

Repo: Jumoo/Our.Umbraco.MaintenanceMode

Opt-in public status URL, and the whitelists documented (#112)
IPNetwork2 3.6.0 → 5.0.1 (#115). Dependabot's lock file only covered net9.0, so all four locked projects were regenerated
Merged the markdown-it and vite bumps (#113, #114) and merged v17 forward to v18 (#116)
Released 17.2.0 and 18.2.0 to NuGet, also including the dashboard label fix