Track pending browsing upvotes

tests/growth-repository.test.ts

@@ -12,7 +12,7 @@ const OTHER_ACCOUNT = '@t2_other:reddit.com';
 /** Migrations that make up account growth, replayed together in the upgrade test. */
 // Browsing migrations depend on the growth tables, so a pre-growth fixture
 // must rewind past both the growth sequence and the later browsing additions.
-const GROWTH_MIGRATION_COUNT = 5;
+const GROWTH_MIGRATION_COUNT = 6;
 
 function thread(id: string, overrides: Partial<RedditPost> = {}): RedditPost {
   return {