Fix lint CI job

Author: caleb531

.github/workflows/lint.yml

@@ -12,22 +12,24 @@ on:
 jobs:
   lint:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v3
 
-      - name: Install Python 3
-        uses: actions/setup-python@v3
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
         with:
-          python-version: "3.11"
+          python-version: ${{ matrix.python-version }}
 
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install -r requirements.txt
+      - name: Check lockfile
+        run: uv lock --check
 
       - name: Run mypy
-        run: uv run mypy .
+        run: mypy ocu/**/*.py tests/*.py
 
       - name: Run ruff
         run: |