ci: Use intel for macos-15 build

Author: jcs090218

.github/workflows/release.yml

@@ -19,12 +19,12 @@ jobs:
       matrix:
         include:
           # TODO: Get host platform from somewher instead of specifying it explicitly here.
-          - os: macos-15
+          - os: macos-15-intel
             bundle_os: macos
             emacs-version: '28.2'
             ext: dylib
             host: x86_64-apple-darwin
-          - os: macos-15
+          - os: macos-15-intel
             bundle_os: macos
             emacs-version: '28.2'
             ext: dylib