try with macos-14 for intel instead

git-svn-id: https://svn.code.sf.net/p/vice-emu/code/trunk@45834 379a1393-f5fb-40a0-bcee-ef074d9b53f7

Author: mrdudz

.github/workflows/build-main-on-push.yml

@@ -532,8 +532,8 @@ jobs:
       fail-fast: false
       matrix:
         silicon:  [ { name: 'Intel Silicon',
-                      runner: 'macos-13',
-                      conf: '--enable-macos-minimum-version=13.0',
+                      runner: 'macos-14',
+                      conf: '--enable-macos-minimum-version=14.0',
                       brew_prefix: '/usr/local' },
                     { name: 'Apple Silicon',
                       runner: 'macos-15-intel',