Close CFP for JuMP-dev 2025 (#170)

Author: matbesancon

_posts/2024-09-26-jump_dev_2025.md

@@ -54,10 +54,8 @@ with the subject line `Visa invitation letter`.
 Similarly to previous years, we invite participants to present work related
 to JuMP.
 
-**Talk submissions are now open, and they will close on February 28, 2025.
-Accepted talks will be notified by March 31, 2025.**
-
-**[Submit a talk for JuMP-dev 2025](https://forms.gle/SzbqwzfsRNW97PZt5)**
+**Talk submissions are now closed.
+Accepted talks will be notified by May 1st, 2025.**
 
 We especially seek talks about JuMP applications and providing feedback on the
 user-experience of using JuMP in industry and teaching.