chore: try installing with uv for ga testing

Author: connorferster

.github/workflows/python-pytest.yml

@@ -26,8 +26,8 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flit
-        flit install
+        python -m pip install uv
+        python -m uv pip install .
     - name: Test black formatted
       run: |
         black handcalcs --check