CI pipeline of dub is totally broken

[Andre Pany]

Hi,

all pull request voters of dub ci pipeline are broken, each with 
another error:

- Error: out of memory (DMD)

- Unknown compiler 'dub-v1.18.0'

- The dependency resolution process is taking too long. The 
dependency graph is likely hitting a pathological case

- Unresolvable dependencies to package vibe-core

I know there is not really a maintainer for Dub anymore, now this 
is really an issue):

Kind regards
André