update ubuntu runner

Author: gfwilliams

.github/workflows/build.yml

@@ -186,7 +186,7 @@ jobs:
   # emulator builds
   build_emulator:
     if: ${{ github.event_name != 'workflow_dispatch' || inputs.enable_emulator }}
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       # devices to build for
       matrix:  # banglejs,   banglejs2