In buildRelease.yml added apt update to emscriptem build since it was failing to find some of the packages called for by apt-get install sdl2

Author: fghalasz

.github/workflows/buildRelease.yml

@@ -503,6 +503,7 @@ jobs:
       - name: Install SDL2
         run: |
           export DEBIAN_FRONTEND=noninteractive
+          sudo -E apt-get update
           sudo -E apt-get install -y libsdl2-dev libsdl2-2.0-0
 
       # Install Emscripten SDK