fix(ci): move audio prebuilds to macOS 15 (#16464)

Co-authored-by: luoyun <[email protected]>

.github/workflows/audio-capture-prebuilds.yml

@@ -42,10 +42,9 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          # arm64 runner; also cross-compiles the x64 slice (see Build step) to
-          # avoid the scarce macos-13 Intel runner that queues 20+ min (#5642).
-          - os: 'macos-14'
-            runner: 'macos-14'
+          # Build both macOS slices on one ARM64 runner.
+          - os: 'macos-15'
+            runner: 'macos-15'
             arch: 'arm64'
             artifact_suffix: 'arm64+x64'
           - os: 'ubuntu-latest'