bump xcode version + carthage visionOS tests

Author: nathanfallet

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
       # https://github.com/CocoaPods/CocoaPods/issues/11839
       run: |
         xcode-select -p
-        sudo xcode-select -s /Applications/Xcode_15.0.1.app/Contents/Developer
+        sudo xcode-select -s /Applications/Xcode_15.3.app/Contents/Developer
     - name: "Lint"
       run: make lint
     - name: "Run tests (PACKAGE_MANAGER_COMMAND: test)"
@@ -64,6 +64,10 @@ jobs:
       env:
         CARTHAGE_PLATFORM: tvOS
       run: ./run-tests.sh
+    - name: "Run tests (CARTHAGE_PLATFORM: visionOS)"
+      env:
+        CARTHAGE_PLATFORM: visionOS
+      run: ./run-tests.sh
   build-linux:
     runs-on: ubuntu-latest
     steps: