Replace deprecated macos-13 runner with macos-15

GitHub has deprecated macos-13 runner. Updated publish-packages.yml
to use macos-15 for x64 macOS testing.

Author: RahulHere

.github/workflows/publish-packages.yml

@@ -72,7 +72,7 @@ jobs:
           - os: macos-14
             platform: darwin-arm64
             lib_ext: "dylib"
-          - os: macos-13
+          - os: macos-15
             platform: darwin-x64
             lib_ext: "dylib"
           - os: windows-latest