DocMeta: Access META binding through invokelatest

Starting in Julia 1.12, global bindings have strict world-age semantics
so this change is required to avoid the warning introduced by
JuliaLang/julia#57133

Author: topolarity

src/DocMeta.jl

@@ -31,14 +31,14 @@ const VALIDMETA = Dict{Symbol, Type}(:DocTestSetup => Union{Expr, Symbol})
 """
 """
 function initdocmeta!(m::Module)
-    if !isdefined(m, META)
+    if !invokelatest(isdefined, m, META)
         @debug "Creating documentation metadata dictionary (META=$META) in $m"
         Core.eval(m, :(const $META = $(METATYPE())))
         push!(METAMODULES, m)
     else
         @warn "Existing documentation metadata dictionary (META=$META) in $m. Ignoring."
     end
-    return getfield(m, META)
+    return invokelatest(getfield, m, META)
 end
 
 """
@@ -48,7 +48,7 @@ Returns the documentation metadata dictionary for the module `m`. The dictionary
 considered immutable and assigning values to it is not well-defined. To set documentation
 metadata values, [`DocMeta.setdocmeta!`](@ref) should be used instead.
 """
-getdocmeta(m::Module) = isdefined(m, META) ? getfield(m, META) : METATYPE()
+getdocmeta(m::Module) = invokelatest(isdefined, m, META) ? invokelatest(getfield, m, META) : METATYPE()
 
 """
     getdocmeta(m::Module, key::Symbol, default=nothing)
@@ -74,7 +74,7 @@ function setdocmeta!(m::Module, key::Symbol, value; warn = true, recursive = fal
             setdocmeta!(mod, key, value; warn = warn, recursive = false)
         end
     else
-        isdefined(m, META) || initdocmeta!(m)
+        invokelatest(isdefined, m, META) || initdocmeta!(m)
         meta = getdocmeta(m)
         if warn && haskey(meta, key)
             @warn "$(key) already set for module $m. Overwriting."