chore: Upgrade uv and pip in CI

- Ensures the latest versions of uv and pip are used in the CI environment.
- This helps in leveraging recent performance improvements and bug fixes.
- The `--upgrade` flag is used to ensure existing installations are updated.

Author: PythonicNinja

.github/workflows/tests.yml

@@ -20,7 +20,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          pip install uv
+          pip install --upgrade uv pip
           make install
 
       - name: Run pytest