Workaround for Julia 1.12 worldage issue

[fingolfin]

Fix part of #1132? Namely those in pkg/JuliaInterface/tst/calls.tst related to function f0() etc..

Based on https://github.com/JuliaLang/julia/pull/57133/files#diff-42a3fc6ebd78315e40602ab4108f5cd380ada14ff81987b696d7b4ee9372a4deR2591-R2600 which adjust the C kernel function jl_get_function to avoid the same warning:

STATIC_INLINE jl_function_t *jl_get_function(jl_module_t *m, const char *name)
{
    jl_task_t *ct = jl_get_current_task();
    size_t last_world = ct->world_age;
    ct->world_age = jl_get_world_counter();
    jl_value_t *r = jl_get_global(m, jl_symbol(name));
    ct->world_age = last_world;
    return (jl_function_t*)r;
}

The warnings involving docmeta are still there, though. I have not yet analyzed where they are triggered exactly (obvious guess is test/doctest.jl); perhaps some invokelatest placed there will resolve them?

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.83%. Comparing base (707f1f8) to head (aea8b0e).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/JuliaInterface/src/JuliaInterface.c	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1134      +/-   ##
==========================================
+ Coverage   81.75%   82.83%   +1.07%     
==========================================
  Files          50       50              
  Lines        3820     3827       +7     
==========================================
+ Hits         3123     3170      +47     
+ Misses        697      657      -40     

Files with missing lines	Coverage Δ
pkg/JuliaInterface/src/JuliaInterface.c	78.90% <88.88%> (+1.22%)	⬆️

... and 2 files with indirect coverage changes

[lgoettgens]

The warnings involving docmeta are still there, though. I have not yet analyzed where they are triggered exactly (obvious guess is test/doctest.jl); perhaps some invokelatest placed there will resolve them?

These are not due do anything in GAP,jl, but are reproducible with just an empty package and Documenter.jl, see JuliaDocs/Documenter.jl#2621.