WARNING: Wrapping `Vararg` directly in UnionAll is deprecated (wrap the tuple instead).

[felixcremer]

When we run the tests we get the following warning: WARNING: Wrapping Vararg directly in UnionAll is deprecated (wrap the tuple instead).

Apparently this is a deprecation warning which was introduced here:

https://github.com/JuliaLang/julia/pull/38136

I have not yet checked where in our code this comes from.