The methods PlayerSettings.GetScriptingDefineSymbolsForGroup/SetScriptingDefineSymbolsForGroup used in GA_PostProcessBuild.cs has been marked obsolete, in favour of PlayerSettings.GetScriptingDefineSymbols/SetScriptingDefineSymbols.
The obsolete methods currently generate compiler warnings in Unity 2023 and Unity 6.
The newer PlayerSettings.GetScriptingDefineSymbols/SetScriptingDefineSymbols methods are available in versions >= 2021.2, 2022.1, 2023.1, 6000.