build(deps): bump the actions group with 1 update

Bumps the actions group with 1 update: [codecov/codecov-action](https://github.com/codecov/codecov-action).


Updates `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
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
       if: >-
         github.event_name != 'schedule' &&
         matrix.os == 'ubuntu-latest'
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         files: ./coverage.xml
         flags: unittests-${{ matrix.python-version }}
@@ -82,7 +82,7 @@ jobs:
 
     - name: Report contrib coverage with Codecov
       if: github.event_name != 'schedule' && matrix.python-version == '3.11' && matrix.os == 'ubuntu-latest'
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         files: ./coverage.xml
         flags: contrib
@@ -99,7 +99,7 @@ jobs:
 
     - name: Report doctest coverage with Codecov
       if: github.event_name != 'schedule' && matrix.python-version == '3.11' && matrix.os == 'ubuntu-latest'
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         files: doctest-coverage.xml
         flags: doctest