Add Xcode 13 to the build/test script.

objectivec/DevTools/full_mac_build.sh

@@ -289,7 +289,7 @@ if [[ "${DO_XCODE_IOS_TESTS}" == "yes" ]] ; then
           -disable-concurrent-destination-testing
       )
       ;;
-    11.* | 12.*)
+    11.* | 12.* | 13.*)
       # Dropped 32bit as Apple doesn't seem support the simulators either.
       XCODEBUILD_TEST_BASE_IOS+=(
           -destination "platform=iOS Simulator,name=iPhone 8,OS=latest" # 64bit
@@ -357,6 +357,11 @@ if [[ "${DO_XCODE_TVOS_TESTS}" == "yes" ]] ; then
         -destination "platform=tvOS Simulator,name=Apple TV 4K,OS=latest"
       )
       ;;
+    13.*)
+      XCODEBUILD_TEST_BASE_TVOS+=(
+        -destination "platform=tvOS Simulator,name=Apple TV 4K (2nd generation),OS=latest"
+      )
+      ;;
     * )
       echo ""
       echo "ATTENTION: Time to update the simulator targets for Xcode ${XCODE_VERSION}"