Migrate to the newer macOS 15 runner

.github/workflows/build_ios.yml

@@ -10,7 +10,7 @@ jobs:
   # Game
   game-windows:
     name: Game (iOS, Release ARM64)
-    runs-on: "macos-14"
+    runs-on: "macos-15"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v6

.github/workflows/build_mac.yml

@@ -10,7 +10,7 @@ jobs:
   # Editor
   editor-mac:
     name: Editor (Mac, Development ARM64)
-    runs-on: "macos-14"
+    runs-on: "macos-15"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v6
@@ -35,7 +35,7 @@ jobs:
   # Game
   game-mac:
     name: Game (Mac, Release ARM64)
-    runs-on: "macos-14"
+    runs-on: "macos-15"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v6

.github/workflows/cd.yml

@@ -150,7 +150,7 @@ jobs:
   # Mac
   package-mac-editor:
     name: Editor (Mac)
-    runs-on: "macos-14"
+    runs-on: "macos-15"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v6
@@ -178,7 +178,7 @@ jobs:
         path: Output/FlaxEditorMac.zip
   package-mac-game:
     name: Game (Mac)
-    runs-on: "macos-14"
+    runs-on: "macos-15"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v6

.github/workflows/cooking.yml

@@ -9,7 +9,7 @@ jobs:
   # Cook on Mac
   cook-mac:
     name: Cook (Mac)
-    runs-on: "macos-14"
+    runs-on: "macos-15"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v6