CI: remove older macos versions

Author: foolnotion

.github/workflows/build-macos.yml

@@ -14,7 +14,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [ macos-11, macos-12, macos-13, macos-14 ]
+        os: [ macos-13, macos-14 ]
     # The CMake configure and build commands are platform agnostic and should work equally well on Windows or Mac.
     # You can convert this to a matrix build if you need cross-platform coverage.
     # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix