build: update macOS runner and Xcode

Xcode 16.4 will be required for Node.js 25.
macOS 15 is required for Xcode 16.4.

Refs: https://github.com/nodejs/node/issues/58069
Co-authored-by: Yagiz Nizipli <yagiz@nizipli.com>
PR-URL: https://github.com/nodejs/node/pull/59238
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>

.github/workflows/test-macos.yml

@@ -30,7 +30,7 @@ concurrency:
 
 env:
   PYTHON_VERSION: '3.12'
-  XCODE_VERSION: '16.1'
+  XCODE_VERSION: '16.4'
   FLAKY_TESTS: keep_retrying
 
 permissions:
@@ -41,7 +41,7 @@ jobs:
     if: github.event.pull_request.draft == false
     strategy:
       fail-fast: false
-    runs-on: macos-14
+    runs-on: macos-15
     env:
       CC: sccache gcc
       CXX: sccache g++