tools: update x64 macOS runner

PR-URL: https://github.com/nodejs/node/pull/60676
Refs: https://github.com/actions/runner-images/issues/13046
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <richard.lau@ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Xuguang Mei <meixuguang@gmail.com>

.github/workflows/test-shared.yml

@@ -108,7 +108,7 @@ jobs:
             system: x86_64-linux
           - runner: ubuntu-24.04-arm
             system: aarch64-linux
-          - runner: macos-13
+          - runner: macos-15-intel
             system: x86_64-darwin
           - runner: macos-latest
             system: aarch64-darwin