CI: macos-13 -> macos-15-intel (#424)

Signed-off-by: Sam <[email protected]>

Author: sagudev

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
       matrix:
         platform:
           - { target: aarch64-apple-darwin, os: macos-14 }
-          - { target: x86_64-apple-darwin, os: macos-13 }
+          - { target: x86_64-apple-darwin, os: macos-15-intel }
           - { target: x86_64-unknown-linux-gnu, os: ubuntu-latest }
           - { target: x86_64-pc-windows-msvc, os: windows-latest }
           - { target: i686-pc-windows-msvc, os: windows-latest }