Add GraphBLAS Forum Update link for SC'25

Add link to slides for the SC25 graphblas forum

Author: tgmattso

README.md

@@ -158,6 +158,8 @@ under Performance.
 
 # Videos and other interesting discussions on GraphBLAS
 
+* [GraphBLAS Forum Update at SC'25] (/docs/GraphBLAS_Update_SC25.pdf) (November 19, 2025)
+  
 * [GraphBLAS Forum Update at SC'22](/docs/GraphBLAS_Update-SC22-FINAL.pdf) (November 15, 2022)
 
 * [Graph Analytics, by Tim Mattson and Henry Gabb, Intel](https://techdecoded.intel.io/big-picture/graph-analytics-a-foundational-building-block-for-the-data-analytics-world/#gs.x2ak71)