Update macOS build matrix to use macos-15-intel instead of the deprecated macos-13 (#590)

Author: kounelisagis

.github/workflows/build-wheels.yml

@@ -92,8 +92,8 @@ jobs:
       matrix:
         buildplat:
           - [ubuntu-22.04, manylinux_x86_64]
-          - [macos-13, macosx_x86_64]
-          - [macos-13, macosx_arm64]
+          - [macos-15-intel, macosx_x86_64]
+          - [macos-15-intel, macosx_arm64]
           - [windows-2022, win_amd64]
         python: ["cp39", "cp310", "cp311", "cp312", "cp313", "cp314"]