Switch LSP workflow from pip to uv via astral-sh/setup-uv action

Author: skrawcz

.github/workflows/hamilton-lsp.yml

@@ -30,11 +30,10 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
+    - uses: astral-sh/setup-uv@v6
     - name: Install dependencies
       run: |
-        python -m pip install --upgrade pip pytest
-        pip install -e ${{ github.workspace }}
-        pip install -e .
+        uv pip install --system -e ${{ github.workspace }} -e . pytest
     - name: Run unit tests
       run: |
         pytest tests/