upgrade ubuntu version

Author: lewisclark

.github/workflows/ci.yml

@@ -7,8 +7,8 @@ jobs:
     strategy:
       matrix:
         os:
-          - { name: Ubuntu 20.04, distro: ubuntu-20.04, gcc_version: 9 }
           - { name: Ubuntu 22.04, distro: ubuntu-22.04, gcc_version: 11 }
+          - { name: Ubuntu 24.04, distro: ubuntu-24.04, gcc_version: 14 }
         build_type: [Debug, Release]
         toolchain: ["gcc-32bit", "gcc-64bit"]