add rsorokin@ as owner of u/w/r/c/chromeos/quick_unlock/

Bug: none
Change-Id: I9bdd56da027f499c223052b17cfc2c5ae06711ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036063
Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738339}

ui/webui/resources/cr_components/chromeos/quick_unlock/OWNERS

+# (in PST)
 alemate@chromium.org
 
+# (in CET)
+rsorokin@chromium.org
+
 # COMPONENT: UI>Settings