CI: Upgrade ubuntu image (#273)

Author: twitchard

.github/workflows/ci.yml

@@ -3,7 +3,7 @@ name: ci
 on: [push]
 jobs:
   compile-without-audio:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout repo
         uses: actions/checkout@v3