Revert change to historical data limit in free plans

Author: RebeccaTamachiro

src/content/plans/index.json

@@ -664,7 +664,7 @@
 				},
 				"historical_data": {
 					"title": "Historical data",
-					"free": "7 days",
+					"free": "8 days",
 					"pro": "31 days",
 					"biz": "31 days",
 					"ent": "31 days"