DBB Migration tool link is broken

In file https://github.com/IBM/dbb/blob/main/Migration/README.md the *DBB Migration Tool" link is not redirecting to right webpage.

<img width="1191" height="453" alt="Image" src="https://github.com/user-attachments/assets/62229aaa-0171-46c7-91d9-66ee6430d41a" />