linux.yml: Drop GCC 11/12 and Clang 15/16/17

Author: hartwork

.github/workflows/linux.yml

@@ -18,30 +18,10 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - cc: gcc-11
-            cxx: g++-11
-            clang_major_version: null
-            clang_repo_suffix: null
-          - cc: gcc-12
-            cxx: g++-12
-            clang_major_version: null
-            clang_repo_suffix: null
           - cc: gcc-13
             cxx: g++-13
             clang_major_version: null
             clang_repo_suffix: null
-          - cc: clang-15
-            cxx: clang++-15
-            clang_major_version: 15
-            clang_repo_suffix: -15
-          - cc: clang-16
-            cxx: clang++-16
-            clang_major_version: 16
-            clang_repo_suffix: -16
-          - cc: clang-17
-            cxx: clang++-17
-            clang_major_version: 17
-            clang_repo_suffix: -17
           - cc: clang-18
             cxx: clang++-18
             clang_major_version: 18