Update macOS image version in CI workflow

macos-13 for x86_64 is hard deprecated per actions/runner-images#13046.

Author: jhubberts

.github/workflows/cli.yml

@@ -18,7 +18,7 @@ jobs:
             image: macos-latest
             arch: aarch64
           - os: macos
-            image: macos-13
+            image: macos-15-intel
             arch: x86_64
           - os: linux
             image: ubuntu-24.04