CI: exclude some compilers

Author: danngreen

.github/workflows/c-cpp.yml

@@ -16,6 +16,11 @@ jobs:
         include:
           - os: macos-latest
             cxx: clang++
+        exclude:
+          - os: ubuntu-22.04
+            cxx: [clang++-17, clang++-18, clang++-19]
+          - os: ubuntu-24.04
+            cxx: [clang++-15, g++-11]
 
     runs-on: ${{ matrix.os }}