Switch acceptance target platform from macos-13 to -14.

Author: TallJimbo

.github/workflows/acceptance.yaml

@@ -7,7 +7,7 @@ jobs:
   accept:
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-13, macos-latest]
+        os: [ubuntu-latest, macos-14, macos-latest]
         include:
           - os: ubuntu-latest
             devel: ""