looks like macos-15 waste quite a lot of time finilizing

Author: sdcb

.github/workflows/opencv.yml

@@ -39,7 +39,7 @@ jobs:
       (matrix.os == 'ubuntu.22.04') && 'ubuntu-22.04' || 
       (matrix.os == 'ubuntu.24.04') && 'ubuntu-24.04' || 
       (matrix.os == 'win' && matrix.arch == 'x64') && 'windows-2022' || 
-      (matrix.os == 'osx' && matrix.arch == 'arm64') && 'macos-15' 
+      (matrix.os == 'osx' && matrix.arch == 'arm64') && 'macos-14' 
       }}
 
     strategy: