cloud: add release notes 20250121 (#20064)

tidb-cloud/tidb-cloud-release-notes.md

@@ -8,6 +8,14 @@ aliases: ['/tidbcloud/supported-tidb-versions','/tidbcloud/release-notes']
 
 This page lists the release notes of [TiDB Cloud](https://www.pingcap.com/tidb-cloud/) in 2025.
 
+## January 21, 2025
+
+**Console changes**
+
+- Support importing a single local CSV file of up to 250 MiB per task to [TiDB Cloud Serverless](/tidb-cloud/select-cluster-tier.md#tidb-cloud-serverless) clusters, increased from the previous limit of 50 MiB.
+
+    For more information, see [Import Local Files to TiDB Cloud](/tidb-cloud/tidb-cloud-import-local-files.md).
+
 ## January 14, 2025
 
 **General changes**