[Android WebAPKs] increase shell update check version to 116

Previously, the update check version is 109. From 109 to 116,
we added a few bug fixes. We'd like to bump the version to
include those fixes for updates.

Bug: 977173
Change-Id: I95c06658753d4fcb66b772be8c8d934dffcf5d7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895955Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Henry Jian <hzjian@google.com>
Cr-Commit-Position: refs/heads/master@{#711865}

chrome/android/webapk/shell_apk/request_update_for_version.gni

@@ -6,4 +6,4 @@
 # if the WebAPK's ShellAPK version is less than
 # |request_update_for_shell_apk_version|. The version should be incremented
 # after a new ShellAPK has been uploaded to the WebAPK Minting Server.
-request_update_for_shell_apk_version = 109
+request_update_for_shell_apk_version = 116