add macos 14 and 15

Author: tgymnich

.github/workflows/Load.yml

@@ -31,7 +31,10 @@ jobs:
         arch:
           - x64
         include:
-          - os: macOS-latest
+          - os: macOS-15
+            version: '1'
+            arch: aarch64
+          - os: macOS-14
             version: '1'
             arch: aarch64