rpl_reporting: sprintf -> snprintf

This was failing to compile with AppleClang 14.0.0.14000029.

Thanks to Arunesh Choudhary for noticing.

sql/rpl_reporting.h

@@ -93,7 +93,7 @@ class Slave_reporting_capability
       localtime_r(&skr, &tm_tmp);
       start=&tm_tmp;
 
-      sprintf(timestamp, "%02d%02d%02d %02d:%02d:%02d",
+      snprintf(timestamp, sizeof(timestamp), "%02d%02d%02d %02d:%02d:%02d",
                start->tm_year % 100,
                start->tm_mon+1,
                start->tm_mday,