Force use 15.1

Author: veler

.github/workflows/ci.yml

@@ -56,7 +56,7 @@ jobs:
     steps:
       - uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: latest-stable
+          xcode-version: '15.1'
       - uses: actions/checkout@v3
       - name: 'Cache: .nuke/temp, ~/.nuget/packages'
         uses: actions/cache@v3