Don't build for ubuntu 20.04 which is now deprecated (#306)

Author: MaartenS11

.github/workflows/compile.yml

@@ -26,7 +26,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                os: [ubuntu-20.04, ubuntu-22.04, ubuntu-24.04, macos-latest]
+                os: [ubuntu-22.04, ubuntu-24.04, macos-latest]
         steps:
             - name: Checkout
               uses: actions/checkout@v4