Update docc.yml

Author: mtj0928

.github/workflows/docc.yml

@@ -6,11 +6,10 @@ on:
       - main
 jobs:
   DocC:
-    runs-on: macos-latest
+    runs-on: macos-15
+    env:
+      DEVELOPER_DIR: "/Applications/Xcode_16.2.app/Contents/Developer"
     steps:
-      - uses: SwiftyLab/setup-swift@latest
-        with:
-          swift-version: "6.0"
       - uses: actions/checkout@v4
       - name: Build DocC
         run: |