fixup! Use C++23

use apt cache

Author: ImSapphire

.github/workflows/c-cpp.yml

@@ -33,9 +33,11 @@ jobs:
 
     - if: matrix.os == 'ubuntu-latest'
       name: Install GCC 16
-      uses: egor-tensin/setup-gcc@v2
+      uses: awalsh128/cache-apt-pkgs-action@v1.6.0
       with:
-        version: 16
+        add-repository: 'ppa:ubuntu-toolchain-r/test'
+        packages: g++-16
+        version: 1.0
 
     - uses: lukka/get-cmake@latest