Increase health check timeouts
The upgrade test pipeline ran multiple times into a health check timeout on nextcloud (and zulip), see !1045 (comment 43870):
flux-system nextcloud 54m False Health check failed after 20m0.042735252s, timeout waiting for: [HelmRelease/stackspin-apps/nextcloud status: 'Unknown': rate: Wait(n=1) would exceed context deadline, Deployment/stackspin-apps/nc-nextcloud status: 'Unknown': rate: Wait(n=1) would exceed context deadline, Deployment/stackspin-apps/nc-onlyoffice-documentserver status: 'Unknown': rate: Wait(n=1) would exceed context deadline]$