Update macOS runner image and XCode version (LMMS#8092)

Author: messmerd

.github/workflows/build.yml

@@ -181,11 +181,11 @@ jobs:
         arch: [ x86_64, arm64 ]
         include:
           - arch: x86_64
-            os: macos-13
-            xcode: "15.2"
+            os: macos-15-intel
+            xcode: "16.4"
           - arch: arm64
-            os: macos-14
-            xcode: "15.4"
+            os: macos-15
+            xcode: "16.4"
     name: macos-${{ matrix.arch }}
     runs-on: ${{ matrix.os }}
     env: