Build(deps): Bump codecov/codecov-action from 3 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3...v4)

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

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

Author: dependabot[bot]

.github/workflows/pythonpackage.yml

@@ -190,7 +190,7 @@ jobs:
       run: python -m pip install "niworkflows[tests]"
     - name: Run tests
       run: pytest -sv --doctest-modules --cov niworkflows --pyargs niworkflows
-    - uses: codecov/codecov-action@v3
+    - uses: codecov/codecov-action@v4
       name: Submit to CodeCov
 
   test-pre:
@@ -245,7 +245,7 @@ jobs:
       run: python -m pip install $PIP_FLAGS "niworkflows[tests]"
     - name: Run tests
       run: pytest -sv --doctest-modules --cov niworkflows --pyargs niworkflows
-    - uses: codecov/codecov-action@v3
+    - uses: codecov/codecov-action@v4
       name: Submit to CodeCov
 
   flake8: