Delete unnecessary eltype method of CompositeException (#54177)

Author: LilithHafner

base/task.jl

@@ -53,7 +53,6 @@ push!(c::CompositeException, ex) = push!(c.exceptions, ex)
 pushfirst!(c::CompositeException, ex) = pushfirst!(c.exceptions, ex)
 isempty(c::CompositeException) = isempty(c.exceptions)
 iterate(c::CompositeException, state...) = iterate(c.exceptions, state...)
-eltype(::Type{CompositeException}) = Any
 
 function showerror(io::IO, ex::CompositeException)
     if !isempty(ex)