fix init max value with lowest numeric limit for argmax

include/aidge/backend/cpu/operator/ArgMaxImpl_kernels.hpp

@@ -51,7 +51,7 @@ void ArgMaxImpl_cpu_forward_kernel(std::int32_t axis_,
         for (std::size_t post = 0; post < stride_post; ++post) {
             const std::size_t idx_i = pre * dim_i * stride_post + post;
             const std::size_t idx_o = pre * stride_post + post;
-            I max = std::numeric_limits<I>::min();
+            I max = std::numeric_limits<I>::lowest();
             for (std::size_t i = 0; i < dim_i; ++i) {
                 I curr_value = input[idx_i + i*stride_post];
                 if (select_last_index) {