Select 16.4

Author: wickwirew

.github/workflows/build.yml

@@ -6,9 +6,12 @@ on:
     branches: ["main"]
 jobs:
   build:
-    runs-on: macos-15
+    runs-on: macos-15A
     steps:
     - uses: actions/checkout@v4
+    - uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: '16.4'
     - name: Build
       run: swift build
     - name: Run tests