Upgrade GitHub Actions toolchain

Author: codex

.github/workflows/ci.yml

@@ -11,14 +11,14 @@ jobs:
     timeout-minutes: 25
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v5
+        uses: astral-sh/setup-uv@v8
 
       - name: Install OpenEnv CLI
         run: python -m pip install git+https://github.com/meta-pytorch/OpenEnv.git