[Shortcuts] Update the request_shell_apk_version.

Use version 122 which includes all the required changes for enabling web
shortcuts for WebAPKs. Coincides with M82.

Change-Id: I3e636ab1a7bf56a9f14b7556cb04902a0d74bbb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095546Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748802}

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 = 116
+request_update_for_shell_apk_version = 122