chore(deps): update codecov/codecov-action action to v6

Author: renovate[bot]

.github/workflows/test.yaml

@@ -25,7 +25,7 @@ jobs:
       - name: Test with pytest
         run: nox -db uv
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
         with:
           use_oidc: true
   pass: