Update actions to use macos-15 and Xcode 16.1

Author: marcosgriselli

.github/workflows/ci.yml

@@ -6,16 +6,16 @@ on:
       - main
 jobs:
   test-bazel:
-    runs-on: macos-13
+    runs-on: macos-15
     steps:
       - uses: actions/checkout@v3
-      - run: sudo xcode-select -s /Applications/Xcode_15.0.app
+      - run: sudo xcode-select -s /Applications/Xcode_16.1.app
       - run: bazelisk build //...
       - run: bazelisk test //...
   test-swiftpm:
     runs-on: macos-13
     steps:
       - uses: actions/checkout@v3
-      - run: sudo xcode-select -s /Applications/Xcode_15.0.app
+      - run: sudo xcode-select -s /Applications/Xcode_16.1.app
       - run: swift build
       - run: swift test