Update Ubuntu versions

Author: schwitanski

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, ubuntu-22.04, macos-latest]
+        os: [ubuntu-22.04, ubuntu-24.04, macos-latest]
         compiler: [gcc, clang]
         exclude:
           - os: macos-latest