Update macOS version in desktop build

Author: vorth

.github/workflows/desktop.yml

@@ -21,8 +21,8 @@ jobs:
       matrix:
         arch: [intel, arm64]
 
-    # macos-13 is an Intel image, apparently, whereas macos-latest is the latest Arm64
-    runs-on: ${{ matrix.arch == 'intel' && 'macos-13' || 'macos-latest' }} 
+    # macos-15 is an Intel image, apparently, whereas macos-latest is the latest Arm64
+    runs-on: ${{ matrix.arch == 'intel' && 'macos-15' || 'macos-latest' }} 
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps: