Use iOS 11 and 12 x64 try and CI builders instead of iOS 9

iOS 9 builders are not deleted yet.

Depends on:
https://chromium-review.googlesource.com/c/chromium/tools/build/+/1460470

Bug: webrtc:10291
Change-Id: I21655c5e88834a43fe220af7dc9912f753b6bdb4
Reviewed-on: https://webrtc-review.googlesource.com/c/121953
Commit-Queue: Artem Titarenko <artit@webrtc.org>
Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
diff --git a/commit-queue.cfg b/commit-queue.cfg
index f8b4776..fa67edb 100644
--- a/commit-queue.cfg
+++ b/commit-queue.cfg
@@ -75,7 +75,10 @@
         name: "webrtc/try/ios_sim_x64_dbg_ios10"
       }
       builders {
-        name: "webrtc/try/ios_sim_x64_dbg_ios9"
+        name: "webrtc/try/ios_sim_x64_dbg_ios11"
+      }
+      builders {
+        name: "webrtc/try/ios_sim_x64_dbg_ios12"
       }
       builders {
         name: "webrtc/try/linux_asan"