ci: Changes xcode version to latest stable

Author: NeedleInAJayStack

.github/workflows/build.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
     - uses: maxim-lobanov/setup-xcode@v1
       with:
-        xcode-version: latest
+        xcode-version: latest-stable
     - uses: actions/checkout@v3
     - name: Build and test
       run: swift test --parallel --enable-test-discovery