Value in error for no partition is not unsigned

[mjonss]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create table t (a bigint unsigned) partition by range (a) (partition p0 values less than (10));
insert into t values (0xffffffffffffffff);

2. What did you expect to see? (Required)

Table has no partition for value 18446744073709551615

3. What did you see instead (Required)

Table has no partition for value -1

4. What is your TiDB version? (Required)

tidb_version(): Release Version: v7.1.0
Edition: Community
Git Commit Hash: 635a4362235e8a3c0043542e629532e3c7bb2756
Git Branch: heads/refs/tags/v7.1.0
UTC Build Time: 2023-05-30 10:50:03
GoVersion: go1.20.3
Race Enabled: false
TiKV Min Version: 6.2.0-alpha
Check Table Before Drop: false
Store: tikv