run rust test on ubuntu instead of 1-gpu-runner (#2003)

.github/workflows/pr-test-rust.yml

@@ -18,7 +18,7 @@ concurrency:
 jobs:
   unit-test-rust:
     if: github.repository == 'sgl-project/sglang' || github.event_name == 'pull_request'
-    runs-on: 1-gpu-runner
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v3