[ci] Use macos 15 intel runner (#1271)

macos-13 is deprecated

Author: tobil4sk

.github/workflows/main.yml

@@ -42,7 +42,7 @@ jobs:
       arch: 64
       sep: /
       ext: .dylib
-      os: macos-13
+      os: macos-15-intel
 
   MacOSArm:
     strategy: