260208.065704.CET [skip ci] include macos-15-intel in test_flang

Author: zaikunzhang

.github/workflows/test_flang.yml

@@ -30,7 +30,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, ubuntu-24.04-arm, macos-latest]
+        os: [ubuntu-latest, ubuntu-24.04-arm, macos-latest, macos-15-intel]
         solver: [newuoa, cobyla, lincoa, bobyqa, uobyqa]
         fflags: [-O1, -O2, -O3, -g, -fast]
         testdim: [small, big]