tidb v8.5.6

For new features, improvements, and bug fixes released in v8.5.6 for TiDB, see TiDB v8.5.6 release notes.

See the difference from the issue perspective:

• pingcap/tidb#65412
• pingcap/tidb#59972
• pingcap/tidb#64537
• pingcap/tidb#57822
• pingcap/tidb#64697
• pingcap/tidb#62920
• pingcap/tidb#65634
• pingcap/tidb#65867
• pingcap/tidb#66125
• pingcap/tidb#63261
• pingcap/tidb#62988
• pingcap/tidb#63131
• pingcap/tidb#66284
• pingcap/tidb#65060
• pingcap/tidb#63778
• pingcap/tidb#65289
• pingcap/tidb#65383
• pingcap/tidb#63995
• pingcap/tidb#58944
• pingcap/tidb#34882
• pingcap/tidb#66749
• pingcap/tidb#58613
• pingcap/tidb#66727
• pingcap/tidb#66725
• pingcap/tidb#48947
• pingcap/tidb#66068
• pingcap/tidb#65815
• pingcap/tidb#57970
• pingcap/tidb#58400
• pingcap/tidb#66974
• pingcap/tidb#65729
• pingcap/tidb#66623
• pingcap/tidb#65929
• pingcap/tidb#59476
• pingcap/tidb#65447
• pingcap/tidb#66994
• pingcap/tidb#66154
• pingcap/tidb#65059
• pingcap/tidb#62541
• pingcap/tidb#64295
• pingcap/tidb#66729
• pingcap/tidb#66110
• pingcap/tidb#66731
• pingcap/tidb#66193
• pingcap/tidb#64176
• pingcap/tidb#63035
• pingcap/tidb#66668
• pingcap/tidb#63294
• pingcap/tidb#66571
• pingcap/tidb#62008
• pingcap/tidb#67138
• pingcap/tidb#60073
• pingcap/tidb#59737
• pingcap/tidb#66985
• pingcap/tidb#62452
• pingcap/tidb#62457
• pingcap/tidb#66997
• pingcap/tidb#66725
• pingcap/tidb#67108
• pingcap/tidb#67546
• pingcap/tidb#67706