fix: assign6 / use c++23

Author: jacobrobertsbaca

assign6/README.md

@@ -12,7 +12,7 @@ You'll also explore the monadic operations that come with the `std::optional` cl
 To run your code, first you'll need to compile it. Open up a terminal (if you are using VSCode, hit <kbd>Ctrl+\`</kbd> or go to **Terminal > New Terminal** at the top). Then make sure that you are in the `assign6/` directory and run:
 
 ```sh
-g++ -std=c++20 main.cpp -o main
+g++ -std=c++23 main.cpp -o main
 ```
 
 Assuming that your code compiles without any compiler errors, you can now do:
@@ -32,7 +32,7 @@ As you are following the instructions below, we recommend intermittently compili
 > On Windows, you may need to compile your code using
 >
 > ```sh
-> g++ -static-libstdc++ -std=c++20 main.cpp -o main
+> g++ -static-libstdc++ -std=c++23 main.cpp -o main
 > ```
 >
 > in order to see output. Also, the output executable may be called `main.exe`, in which case you'll run your code with: