Add link for student blogs 2025 (#1775)

Author: maszyman

_activities/gsoc.md

@@ -53,6 +53,7 @@ Project from previous years are showcased in blog posts written by students. If
 
 See here the student blog posts from previous years:
 
+* [Student blogs 2025]({{ site.baseurl }}/gsoc/2025/blogs.html)
 * [Student blogs 2024]({{ site.baseurl }}/gsoc/2024/blogs.html)
 * [Student blogs 2023]({{ site.baseurl }}/gsoc/2023/blogs.html)
 * [Student blogs 2022]({{ site.baseurl }}/gsoc/2022/blogs.html)