update bench v2

Author: hero78119

.github/workflows/run-benchmark-v2.yml

@@ -41,7 +41,7 @@ jobs:
       - name: Setup Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-          toolchain: nightly-2025-08-18 # keep it same with ceno repo
+          toolchain: nightly-2025-11-20 # keep it same with ceno repo
           components: rust-src
           cache: false