Extend expiry of flag align-font-display-auto-lcp

The flag was originally set to expire by M85, but is still being
experimented. Hence, we extend its expiry to M87.

Change-Id: If2b16c1c8992f14bb5d39c09581b3fc764d31752
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335762
Auto-Submit: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794756}

chrome/browser/flag-metadata.json

@@ -52,7 +52,7 @@
   {
     "name": "align-font-display-auto-lcp",
     "owners": [ "xiaochengh" ],
-    "expiry_milestone": 85
+    "expiry_milestone": 87
   },
   {
     "name": "allow-disable-mouse-acceleration",