ci: fix versions

.github/workflows/main.yml

@@ -68,8 +68,7 @@ jobs:
 
       - name: Install package
         run: |
-          uv pip install --upgrade pip
-          uv pip install -e .[test] pytest-xdist   # for multiprocessing
+          uv pip install --system -e .[test] pytest-xdist   # for multiprocessing
 
       - name: Test package
         run: python -m pytest --doctest-modules --cov=hepstats --cov-report=xml -n auto
@@ -107,13 +106,16 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+
       - uses: actions/setup-python@v5
         with:
           python-version: "3.11"
       - name: Install dependencies
         run: |
-          pip install -U -q -e .[docs]
-          pip list
+          uv pip install --system -e .[docs]
       - name: build docs
         run: |
           sphinx-build -b html docs docs/_build/html