Use latest stable Xcode

Author: messense

.github/workflows/CI.yml

@@ -29,7 +29,7 @@ jobs:
       - uses: maxim-lobanov/setup-xcode@v1
         if: ${{ matrix.os == 'macos-latest' && matrix.rust == '1.56.0' }}
         with:
-          xcode-version: 13
+          xcode-version: latest-stable
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal