misc(ci): Use xcode 13.1

13.1 is the oldest available on the latest macos runner image

* https://github.com/actions/runner-images/blob/main/images/macos/macos-12-Readme.md#xcode
* https://github.com/marketplace/actions/setup-xcode-version

.github/workflows/build.yml

@@ -10,6 +10,9 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: 'recursive'
+      - uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: '13.1'
       - name: Build
         run: |
           gem install --verbose xcpretty