fix(ci): upgrade to macos-15 runner for Swift Testing framework

Swift Testing (import Testing) requires Xcode 16+ / Swift 6.
macos-14 only has Xcode 15.4. Switch to macos-15 which has
Xcode 16 with the Testing module. Remove manual xcode-select.

Author: pumaurya-source

.github/workflows/build-release.yml

@@ -8,14 +8,11 @@ on:
 jobs:
   build:
     name: Build ScreenMind
-    runs-on: macos-14
+    runs-on: macos-15
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Select Xcode
-        run: sudo xcode-select -s /Applications/Xcode_15.4.app/Contents/Developer
-
       - name: Run Tests
         run: swift test
 

.github/workflows/test.yml

@@ -8,14 +8,11 @@ on:
 jobs:
   test:
     name: Run Tests
-    runs-on: macos-14
+    runs-on: macos-15
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Select Xcode
-        run: sudo xcode-select -s /Applications/Xcode_15.4.app/Contents/Developer
-
       - name: Show Swift Version
         run: swift --version