[developer] Fix Lab 7.2.4 stale question and solution (#27)

The question was based on the last 12 months, which didn't return any
data as of October 2024. We updated the question to each month of 2023
and this is the solution update.

developer/07_aggregations_in_mvs/lab_7.2.sql

@@ -75,8 +75,8 @@ SELECT
     max(max_price)
 FROM uk_prices_aggs_dest
 WHERE
-    month >= (toStartOfMonth(now()) - (INTERVAL 12 MONTH))
-    AND month < toStartOfMonth(now())
+    month >= toDate('2023-01-01')
+    AND month < toDate('2024-01-01')
 GROUP BY month
 ORDER BY month DESC;
 
@@ -110,4 +110,4 @@ SELECT
     max(max_price)
 FROM uk_prices_aggs_dest
 WHERE toYYYYMM(month) = '202408'
-GROUP BY month;
+GROUP BY month;