Use latest release of icx compiler in CI, and update the correspondin…

…g gcc that's installed with it.

.github/workflows/CI.yml

@@ -100,12 +100,12 @@ jobs:
         hwloc-ls --version
     - name: install gcc
       run: |
-        sudo apt-get install gcc-13 g++-13
+        sudo apt-get install gcc-14 g++-14
     - name: install icx
       run: |
         wget -O - https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS.PUB | sudo apt-key add - && break || sleep 1
         sudo apt-add-repository 'deb https://apt.repos.intel.com/oneapi all main' && break || sleep 1
-        sudo apt-get install intel-oneapi-compiler-dpcpp-cpp-and-cpp-classic-2023.2.4
+        sudo apt-get install intel-oneapi-compiler-dpcpp-cpp-and-cpp-classic-2024.2.1
         source /opt/intel/oneapi/setvars.sh
         icx -v
     - name: build qthreads