[Tiny]Upgrade README for sgl-kernel (#13945)

Author: Fridge003

sgl-kernel/README.md

@@ -12,7 +12,7 @@
 SGL Kernel provides optimized compute primitives for the SGLang framework, enabling efficient inference for large language models and vision-language models through custom kernel operations.
 
 ## Installation
-Requires torch == 2.8.0
+Requires torch == 2.9.1
 
 ```bash
 # Latest version