Bump enterprise-reporting-in-browser expire date

Change-Id: Ia417d2d3c4eb49b0fca84eeeaf0bcd0f3ca79b12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031205Reviewed-by: Yann Dago <ydago@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736907}

chrome/browser/flag-metadata.json

@@ -2190,7 +2190,7 @@
   {
     "name": "enterprise-reporting-in-browser",
     "owners": [ "pastarmovj", "zmin" ],
-    "expiry_milestone": 81
+    "expiry_milestone": 83
   },
   {
     "name": "enterprise-reporting-in-chromeos",