Modernize a bit the code using is_const_v

src/utils/Array.hpp

@@ -60,7 +60,7 @@ class [[nodiscard]] Array
   PUGS_INLINE
   void fill(const DataType& data) const
   {
-    static_assert(not std::is_const<DataType>(), "Cannot modify Array of const");
+    static_assert(not std::is_const_v<DataType>, "Cannot modify Array of const");
 
     Kokkos::deep_copy(m_values, data);
   }
@@ -72,7 +72,7 @@ class [[nodiscard]] Array
     static_assert(std::is_same<std::remove_const_t<DataType>, std::remove_const_t<DataType2>>(),
                   "Cannot assign Array of different type");
     // ensures that const is not lost through copy
-    static_assert(((std::is_const<DataType2>() and std::is_const<DataType>()) or not std::is_const<DataType2>()),
+    static_assert(((std::is_const_v<DataType2> and std::is_const_v<DataType>) or not std::is_const_v<DataType2>),
                   "Cannot assign Array of const to Array of non-const");
     m_values = array.m_values;
     return *this;