[Deps] Retire the CUDA 12 lane (#38404)

Co-authored-by: Mohammad Angkad <mohammad.angkad@radixark.ai>

.github/workflows/release-pypi-nightly.yml

@@ -113,13 +113,13 @@ jobs:
     environment: 'prod'
     strategy:
       fail-fast: false
-      # The wheel is CUDA-agnostic and built once — we just register the same
-      # artifact under cu129/sglang/ and cu130/sglang/ wheel indexes so users
-      # can install via either --extra-index-url. Serialize because both matrix
-      # runs clone and push to the same sgl-whl branch.
+      # The wheel is CUDA-agnostic and built once — we just register it under
+      # the cu130/sglang/ wheel index so users can install via
+      # --extra-index-url. Serialize because matrix runs clone and push to the
+      # same sgl-whl branch.
       max-parallel: 1
       matrix:
-        cuda_version: ['129', '130']
+        cuda_version: ['130']
     steps:
       - uses: actions/checkout@v4