Bump allow-insecure-localhost expiry

Updates flag expiry from M-82 to M-87.

Change-Id: I338cc57a42de6cd15af217cfc68046f40c02b616
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2073225
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Auto-Submit: Christopher Thompson <cthomp@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744510}

chrome/browser/flag-metadata.json

@@ -61,7 +61,7 @@
   {
     "name": "allow-insecure-localhost",
     "owners": [ "security-dev" ],
-    "expiry_milestone": 82
+    "expiry_milestone": 87
   },
   {
     "name": "allow-popups-during-page-unload",