C.183: Mention bit_cast as a C++20+ solution

Author: xuhdev

CppCoreGuidelines.md

@@ -9032,7 +9032,8 @@ but at least we can see that something tricky is going on.)
 Unfortunately, `union`s are commonly used for type punning.
 We don't consider "sometimes, it works as expected" a conclusive argument.
 
-C++17 introduced a distinct type `std::byte` to facilitate operations on raw object representation.  Use that type instead of `unsigned char` or `char` for these operations.
+C++17 and C++20 introduced `std::byte` and `std::bit_cast`, respectively, to facilitate operations on raw object representations. Use `std::byte` instead of
+`unsigned char` or `char` for these operations.
 
 ##### Enforcement