cmake.yml: Remove macOS 10

actions/runner-images#5583

Author: amitdo

.github/workflows/cmake.yml

@@ -15,12 +15,6 @@ jobs:
       matrix:
         config:
 
-          - { name: macos-10.15-clang-12-cmake, os: macos-10.15, cxx: clang++ } # default
-          - { name: macos-10.15-clang-11-cmake, os: macos-10.15, cxx: '$(brew --prefix llvm)/bin/clang++' }  #installed
-          - { name: macos-10.15-gcc-9-cmake, os: macos-10.15, cxx: g++-9 } #installed
-          - { name: macos-10.15-gcc-10-cmake, os: macos-10.15, cxx: g++-10 } #installed
-          - { name: macos-10.15-gcc-11-cmake, os: macos-10.15, cxx: g++-11 } #installed
-
           - { name: macos-11-clang-12-cmake, os: macos-11, cxx: clang++ } # default
           # - { name: macos-11-clang-11-cmake, os: macos-11, cxx: '$(brew --prefix llvm)/bin/clang++' }  #installed
           - { name: macos-11-gcc-9-cmake, os: macos-11, cxx: g++-9 } #installed