GLMakie precompilation warning in Julia 1.10

[chriswaudby]

I just downloaded Julia 1.10 and in a clean environment ran ] add GLMakie. I got the warning below during precompilation, although if I just ignore the warning Makie seems to work OK...

Precompiling project...
  251 dependencies successfully precompiled in 262 seconds. 9 already precompiled.
  1 dependency had output during precompilation:
┌ GLMakie
│  [pid 41635] waiting for IO to finish:
│   Handle type        uv_handle_t->data
│   timer              0x7f9416183dc0->0x10f3f9030
│  This means that a package has started a background task or event source that has not finished running. For precompilation to complete successfully, the event source needs to be closed explicitly. See the developer documentation on fixing precompilation hangs for more help.
└  

System info:

julia> versioninfo()
Julia Version 1.10.0
Commit 3120989f39b (2023-12-25 18:01 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: macOS (x86_64-apple-darwin22.4.0)
  CPU: 8 × Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-15.0.7 (ORCJIT, icelake-client)
  Threads: 1 on 8 virtual cores

[ederag]

Same observation here with Makie 0.20 and julia 1.10.4,
and a documentation build hanged just after that (but this might be unrelated).

Upgrading to Makie 0.21.7 did not help (CI log).