Update guild features (#102)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

discord/types/guild.py

@@ -170,6 +170,7 @@ class UnavailableGuild(TypedDict):
     "NEW_THREAD_PERMISSIONS",
     "NON_COMMUNITY_RAID_ALERTS",
     "PARTNERED",
+    "PIN_PERMISSION_MIGRATION_COMPLETE",
     "PREMIUM_TIER_3_OVERRIDE",
     "PREVIEW_ENABLED",
     "PRIVATE_THREADS",