chore(deps): update microsoft/react-native-test-app action to v2.3.12 (#2285)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/pr.yml

@@ -108,7 +108,7 @@ jobs:
         run: |
           yarn
       - name: Install Pods
-        uses: microsoft/react-native-test-app/.github/actions/cocoapods@2.3.9
+        uses: microsoft/react-native-test-app/.github/actions/cocoapods@2.3.12
         with:
           project-directory: ios
           working-directory: packages/test-app