Use invokelatest after eval to adjust to upcoming julia change

In 1.12, we're cleaning up when implicit world age increments happen
at toplevel. Because these test `eval` an expression and immediately
call it, an `invokelatest` will likely be required (as it would be
right now in local scope). See JuliaLang/julia#56509

test/expressions.jl

@@ -249,10 +249,10 @@ end
         anon = :((t, x) -> f(t, x, 1, d = 1))
         @test InfiniteOpt._process_func_expr(error, anon) == (esc(anon), esc(:(t,x)), true)
         anon = :((t, x[1]) -> sin(t + x[1]))
-        @test eval(InfiniteOpt._process_func_expr(error, anon)[1].args[1])(0.5, 0.2) == sin(0.5 + 0.2)
+        @test invokelatest(eval(InfiniteOpt._process_func_expr(error, anon)[1].args[1]), 0.5, 0.2) == sin(0.5 + 0.2)
         anon = :(t[i] -> t[i] + 3)
-        @test eval(InfiniteOpt._process_func_expr(error, anon)[1].args[1])(2) == 5
-        # test errors 
+        @test invokelatest(eval(InfiniteOpt._process_func_expr(error, anon)[1].args[1]), 2) == 5
+        # test errors
         @test_throws ErrorException InfiniteOpt._process_func_expr(error, :(f(t, d = 2)))
         @test_throws ErrorException InfiniteOpt._process_func_expr(error, :(f(x, t; d = 2)))
         @test_throws ErrorException InfiniteOpt._process_func_expr(error, :(f >= 2))