Bump codecov/codecov-action from v1.0.14 to v1.0.15 (#290)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from v1.0.14 to v1.0.15.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Commits](codecov/codecov-action@v1.0.14...239febf)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Karandeep Johar <[email protected]>

Author: dependabot[bot]

.github/workflows/coverage.yml

@@ -28,7 +28,7 @@ jobs:
           coverage run --rcfile=.coveragerc -m pytest test/test_dropbox_unit.py
           coverage xml
       - name: Publish Coverage
-        uses: codecov/[email protected].14
+        uses: codecov/[email protected].15
         with:
           flags: unit
           fail_ci_if_error: true