Update docc.yml (#23)

.github/workflows/docc.yml

@@ -1,21 +1,27 @@
 name: docc
 on:
   push:
-    branches: ["main"]
+    branches: [ "main" ]
 permissions:
   contents: read
   pages: write
   id-token: write
 concurrency:
-  group: "pages"
+  group: pages
   cancel-in-progress: true
 jobs:
   pages:
     environment:
       name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: macos-12
+      url: '${{ steps.deployment.outputs.page_url }}'
+    runs-on: macos-latest
     steps:
+      - uses: swift-actions/setup-swift@v1
+      - name: git checkout
+        uses: actions/checkout@v3
+      - name: docbuild
+        run: >
+          sudo xcode-select -s /Applications/Xcode_16.0.app;
       - name: git checkout
         uses: actions/checkout@v3
       - name: docbuild