Experimental build/electron 32

[ClementPasteau]

• Upgraded electron to 32.3.3 and electron-builder to 26.4.0
• had to replace discord-rich-presence to @xhayper/discord-rpc so electron-builder could not be blocked by native dependencies of that package. (haven't tested it, but it starts properly)
• had to replace live-server to five-server for the same reason (tested the preview locally, works fine)
• had to specify splitting the asar source files for steamworks.js for Mac, as we build a universal dmg but they have different sources
• in the backend build services, also updated electron-builder to 26.4.0 to match the game version

Tested:

• gdevelop windows & mac, builds fine & works
• game built with new versions in GDevelop and new versions in backend service - works for windows & mac
• game build with old versions in GDevelop and new versions in backend service - works for windows & mac