ci(deps): bump codecov/codecov-action from 4 to 5

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -74,7 +74,7 @@ jobs:
           uv run pytest tests/ --cov=src --cov-report=xml --cov-report=html --cov-fail-under=56
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           file: ./coverage.xml
           flags: unittests