update xcode macos

Change-Id: Ie4282f3319c9b6b77cfaeba10c094720f7069d87

Author: tonychanchen

.github/workflows/opensource.yml

@@ -14,11 +14,11 @@ on:
 
 jobs:
   Build:
-    runs-on: macos-11
+    runs-on: macos-12
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: pod cache
-      uses: actions/cache@v2
+      uses: actions/cache@v3
       with:
         path: Pods
         key: ${{ runner.os }}-pods-${{ hashFiles('**/Podfile.lock') }}