Fix Wdeprecated-literal-operator warning

Author: guusw

src/entt/core/hashed_string.hpp

@@ -291,7 +291,7 @@ inline namespace literals {
  * @param str The literal without its suffix.
  * @return A properly initialized hashed string.
  */
-[[nodiscard]] constexpr hashed_string operator"" _hs(const char *str, std::size_t) noexcept {
+[[nodiscard]] constexpr hashed_string operator""_hs(const char *str, std::size_t) noexcept {
     return hashed_string{str};
 }
 
@@ -300,7 +300,7 @@ inline namespace literals {
  * @param str The literal without its suffix.
  * @return A properly initialized hashed wstring.
  */
-[[nodiscard]] constexpr hashed_wstring operator"" _hws(const wchar_t *str, std::size_t) noexcept {
+[[nodiscard]] constexpr hashed_wstring operator""_hws(const wchar_t *str, std::size_t) noexcept {
     return hashed_wstring{str};
 }