Bump codecov/codecov-action from 5.3.1 to 5.4.0

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 5.3.1 to 5.4.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5.3.1...v5.4.0)

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

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

Author: dependabot[bot]

.github/workflows/main.yml

@@ -53,7 +53,7 @@ jobs:
       - name: Run tests
         run: tox
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v5.3.1
+        uses: codecov/codecov-action@v5.4.0
         with:
           env_vars: PYTHON
         env: