update PDF links to 5.2

Author: fonsp

README.md

@@ -45,8 +45,8 @@ News and Announcements
 
 All course materials are available in the table below. If necessary, you can download the lecture notes in PDF format here:
 
-- [B lecture notes](https://github.com/bmlip/course/releases/download/v5.1/BMLIP.B.Lectures.pdf) version 10-Nov-2025
-- [W lecture notes](https://github.com/bmlip/course/releases/download/v5.1/BMLIP.W.Lectures.pdf) version 10-Nov-2025
+- [B lecture notes](https://github.com/bmlip/course/releases/download/v5.2/BMLIP.B.Lectures.pdf) version 12-Nov-2025
+- [W lecture notes](https://github.com/bmlip/course/releases/download/v5.2/BMLIP.W.Lectures.pdf) version 12-Nov-2025
 
 We recommend that you read the lecture notes in your browser to take advantage of the interactive materials that we prepared for this course, based on [Pluto.jl](https://plutojl.org/).