build: Activate uv environment in coverage workflow.

Author: NullPointerDepressiveDisorder

.github/workflows/coverage.yml

@@ -15,6 +15,7 @@ jobs:
       - name: Set up uv
         uses: astral-sh/setup-uv@v7
         with:
+          activate-environment: "true"
           python-version: "3.13"
 
       - name: Install dependencies