Update ignore versions

Author: mborland

include/boost/decimal/detail/from_string.hpp

@@ -20,7 +20,7 @@
 namespace boost {
 namespace decimal {
 
-#if defined(__clang__) && (__clang_major__ >= 6 && __clang_major__ < 14)
+#if defined(__clang__) && (__clang_major__ >= 6 && __clang_major__ < 15)
 #  pragma clang diagnostic push
 #  pragma clang diagnostic ignored "-Wundefined-inline"
 #endif
@@ -29,7 +29,7 @@ namespace decimal {
 BOOST_DECIMAL_EXPORT template <BOOST_DECIMAL_DECIMAL_FLOATING_TYPE TargetDecimalType>
 constexpr auto from_chars(const char* first, const char* last, TargetDecimalType& value, chars_format fmt = chars_format::general) noexcept -> from_chars_result;
 
-#if defined(__clang__) && (__clang_major__ >= 6 && __clang_major__ < 14)
+#if defined(__clang__) && (__clang_major__ >= 6 && __clang_major__ < 15)
 #  pragma clang diagnostic pop
 #endif