chore(mobile): use Xcode and iOS 27.1 SDK for CI builds (#32632)

(cherry picked from commit cb4195ad439ba962a2def7f04738eafc749554d9)

.github/workflows/build-mobile.yml

@@ -204,7 +204,7 @@ jobs:
       contents: read
     # Run on main branch or workflow_dispatch, or on PRs/other branches (build only, no upload)
     if: ${{ !github.event.pull_request.head.repo.fork && fromJSON(needs.pre-job.outputs.should_run).mobile == true }}
-    runs-on: macos-26
+    runs-on: xcode-27
 
     steps:
       - id: token
@@ -214,8 +214,8 @@ jobs:
           private-key: ${{ secrets.PUSH_O_MATIC_APP_KEY }}
           permission-contents: read
 
-      - name: Select Xcode 26
-        run: sudo xcode-select -s /Applications/Xcode_26.2.app/Contents/Developer
+      - name: Select Xcode 27.1
+        run: sudo xcode-select -s /Applications/Xcode_27.1.app/Contents/Developer
 
       - name: Checkout code
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1