build(deps): bump django from 1.11.23 to 1.11.28 in /pipeline (#1790)

Bumps [django](https://github.com/django/django) from 1.11.23 to 1.11.28.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@1.11.23...1.11.28)

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

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