update runner to MacOS13, Xcode 15

Author: MattKiazyk

.github/workflows/ci.yml

@@ -8,10 +8,10 @@ on:
 
 jobs:
   test:
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
     - uses: actions/checkout@v3
     - name: Run tests
       env:
-        DEVELOPER_DIR: /Applications/Xcode_14.2.app
+        DEVELOPER_DIR: /Applications/Xcode_15.0.1.app
       run: xcodebuild test -scheme Xcodes