Temporary disable old compilers

Author: SergiusTheBest

.github/workflows/ci.yml

@@ -45,13 +45,13 @@ jobs:
           { os: ubuntu-24.04,   cxx: g++-14,      pkgs: '' }, # (default on Noble 24.04)
           { os: ubuntu-22.04,   cxx: g++-11,      pkgs: '' }, # (default on Jammy 22.04)
           { os: ubuntu-22.04,   cxx: g++-9,       pkgs: '' }, # (default on Focal 20.04)
-          { os: ubuntu-22.04,   cxx: g++-7,       pkgs: 'g++-7' }, # (default on Bionic 18.04)
-          { os: ubuntu-22.04,   cxx: g++-5,       pkgs: 'g++-5',   repo: 'xenial' }, # (default on Xenial 16.04)
-          { os: ubuntu-22.04,   cxx: g++-4.8,     pkgs: 'g++-4.8', repo: 'trusty' }, # (default on Trusty 14.04)
+          #{ os: ubuntu-22.04,   cxx: g++-7,       pkgs: 'g++-7' }, # (default on Bionic 18.04)
+          #{ os: ubuntu-22.04,   cxx: g++-5,       pkgs: 'g++-5',   repo: 'xenial' }, # (default on Xenial 16.04)
+          #{ os: ubuntu-22.04,   cxx: g++-4.8,     pkgs: 'g++-4.8', repo: 'trusty' }, # (default on Trusty 14.04)
           # linux: clang
           { os: ubuntu-24.04,   cxx: clang++-18,  pkgs: '' },
           { os: ubuntu-22.04,   cxx: clang++-14,  pkgs: '' },
-          { os: ubuntu-22.04,   cxx: clang++-6.0, pkgs: 'clang-6.0' },
+          #{ os: ubuntu-22.04,   cxx: clang++-6.0, pkgs: 'clang-6.0' },
           # windows: msvc
           { os: windows-2019,   cxx: 'vs2019' },
           { os: windows-2022,   cxx: 'vs2022' },