Avoid C++23 deprecation warnings from float_denorm_style

this change fixes errors emitted by MS compiler:
```
1>C:\abseil-cpp\absl\numeric\int128.h(278,20): error C4996: 'std::float_denorm_style': warning STL4042: std::float_denorm_style, std::numeric_limits::has_denorm, and std::numeric_limits::has_denorm_loss are deprecated in C++23. You can define _SILENCE_CXX23_DENORM_DEPRECATION_WARNING or _SILENCE_ALL_CXX23_DEPRECATION_WARNINGS to suppress this warning.
```

absl/numeric/int128.h

@@ -269,7 +269,9 @@ class numeric_limits<absl::uint128> {
  static constexpr bool has_infinity = false;
  static constexpr bool has_quiet_NaN = false;
  static constexpr bool has_signaling_NaN = false;
+ABSL_INTERNAL_DISABLE_DEPRECATED_DECLARATION_WARNING
  static constexpr float_denorm_style has_denorm = denorm_absent;
+ABSL_INTERNAL_RESTORE_DEPRECATED_DECLARATION_WARNING
  static constexpr bool has_denorm_loss = false;
  static constexpr float_round_style round_style = round_toward_zero;
  static constexpr bool is_iec559 = false;
@@ -512,7 +514,9 @@ class numeric_limits<absl::int128> {
  static constexpr bool has_infinity = false;
  static constexpr bool has_quiet_NaN = false;
  static constexpr bool has_signaling_NaN = false;
+ABSL_INTERNAL_DISABLE_DEPRECATED_DECLARATION_WARNING
  static constexpr float_denorm_style has_denorm = denorm_absent;
+ABSL_INTERNAL_RESTORE_DEPRECATED_DECLARATION_WARNING
  static constexpr bool has_denorm_loss = false;
  static constexpr float_round_style round_style = round_toward_zero;
  static constexpr bool is_iec559 = false;