core: add missing const

include/eigenpy/utils/is-aligned.hpp

 //
-// Copyright (c) 2020 INRIA
+// Copyright (c) 2020-2023 INRIA
 //
 
 #ifndef __eigenpy_utils_is_aligned_hpp__
 #define __eigenpy_utils_is_aligned_hpp__
 
 namespace eigenpy {
-inline bool is_aligned(void* ptr, std::size_t alignment) {
+inline bool is_aligned(const void* ptr, std::size_t alignment) {
   return (reinterpret_cast<std::size_t>(ptr) & (alignment - 1)) == 0;
 }
 }  // namespace eigenpy