remove loong64 arch in release notes v8.5.2 (#21198)

Author: hfxsd

releases/release-8.5.2.md

@@ -16,7 +16,6 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.5/quick-start-with-
 + TiDB 
 
     - Limit the execution of GC for TTL tables and related statistics collection tasks to the owner node, thereby reducing overhead [#59357](https://github.com/pingcap/tidb/issues/59357) @[lcwangchao](https://github.com/lcwangchao)
-    - TiDB supports compilation and building on the Loongson loong64 architecture [#59051](https://github.com/pingcap/tidb/issues/59051) @[D3Hunter](https://github.com/D3Hunter)
 
 + TiKV