Remove deprecated APIs

include/fmt/format.h

@@ -3318,13 +3318,6 @@ constexpr auto operator"" _a(const char* s, size_t) -> detail::udl_arg<char> {
   return {s};
 }
 #  endif
-
-// DEPRECATED!
-// User-defined literal equivalent of fmt::format.
-FMT_DEPRECATED constexpr auto operator"" _format(const char* s, size_t n)
-    -> detail::udl_formatter<char> {
-  return {{s, n}};
-}
 }  // namespace literals
 #endif  // FMT_USE_USER_DEFINED_LITERALS