ci: update to last intel macos image (#195)

Signed-off-by: Henry Schreiner <henryfs@princeton.edu>

Author: henryiii

.github/workflows/wheels.yml

@@ -44,7 +44,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-13, macos-latest, windows-latest, ubuntu-24.04-arm, windows-11-arm]
+        os: [ubuntu-latest, macos-15-intel, macos-latest, windows-latest, ubuntu-24.04-arm, windows-11-arm]
 
     steps:
     - uses: actions/checkout@v5