MDEV-11712: ArmHF EXPLAIN JSON garbage longlong values printed

Make sure printing with snprintf uses the correct typed parameters.

sql/field.cc

@@ -10600,7 +10600,7 @@ Create_field::Create_field(THD *thd, Field *old_field, Field *orig_field)
     if (length != 4)
     {
       char buff[sizeof("YEAR()") + MY_INT64_NUM_DECIMAL_DIGITS + 1];
-      my_snprintf(buff, sizeof(buff), "YEAR(%lu)", length);
+      my_snprintf(buff, sizeof(buff), "YEAR(%llu)", length);
       push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
                           ER_WARN_DEPRECATED_SYNTAX,
                           ER_THD(thd, ER_WARN_DEPRECATED_SYNTAX),