[LWM] Update GH runners for macOS ARM and Intel (FujiNetWIFI#1062)

- remove deprecated macOS 13
- add macOS 15 for both ARM and Intel

Author: a8jan

.github/workflows/build-fujinet-pc.yml

@@ -47,12 +47,16 @@ jobs:
             runner: ubuntu-24.04
             target: ubuntu-24.04-amd64
             default-shell: bash
-          - name: macOS 13
-            target: macos-13
-            runner: macos-13
+          - name: macOS 15 ARM
+            target: macos-15-arm64
+            runner: macos-15
             default-shell: bash
-          - name: macOS 14
-            target: macos-14
+          - name: macOS 15 Intel
+            target: macos-15-x64
+            runner: macos-15-intel
+            default-shell: bash
+          - name: macOS 14 ARM
+            target: macos-14-arm64
             runner: macos-14
             default-shell: bash
           - name: Windows