Ubuntu 24.04 does not have g++-15

Author: demianmnave

.github/workflows/linux-ninja-gcc.yml

@@ -21,7 +21,6 @@ jobs:
         include:
         - ver: "13"
         - ver: "14"
-        - ver: "15"
     env:
       ENV_COMPILER_VERSION: "-${{ matrix.ver }}"
     name: "(linux-ninja-gcc-s-vcpkg-${{ matrix.ver }})"