chore(docs): Update Readme - Lakekeeper repository moved (#810)

Author: c-thiel

README.md

@@ -100,7 +100,7 @@ The Apache Iceberg community is built on the principles described in the [Apache
 ## Users
 
 - [Databend](https://github.com/datafuselabs/databend/): An open-source cloud data warehouse that serves as a cost-effective alternative to Snowflake.
-- [iceberg-catalog](https://github.com/hansetag/iceberg-catalog): A Rust implementation of the Iceberg REST Catalog specification.
+- [Lakekeeper](https://github.com/lakekeeper/lakekeeper/): An Apache-licensed Iceberg REST Catalog with data access controls.
 - [RisingWave](https://github.com/risingwavelabs/risingwave): A Postgres-compatible SQL database designed for real-time event streaming data processing, analysis, and management.
 
 ## License