Update the simulator to sr2023.5

This release focusses on improvements for match running and is
released mostly so competitors can run the same code as is planned
to be used for the virtual competition. The only competitor facing
change is a compatibility alias of a property.

Author: PeterJCLaw

simulator/index.md

@@ -35,7 +35,7 @@ local development you will need to install these yourself.
 ### Installing the simulation
 
 1. Create a directory, perhaps called `simulation` where you will store your robot code.
-2. [Download the simulation](https://github.com/srobo/competition-simulator/releases/download/sr2023.4/competition-simulator-sr2023.4.zip), the latest version is sr2023.4, released on 2023-02-15.
+2. [Download the simulation](https://github.com/srobo/competition-simulator/releases/download/sr2023.5/competition-simulator-sr2023.5.zip), the latest version is sr2023.5, released on 2023-02-22.
 3. Unzip the simulation as a subdirectory of the directory you created in the first step:
     ```
     simulation