Bump examples from 58f48a0 to 6c40475 (#987)

Bumps [examples](https://github.com/marian-nmt/marian-examples) from `58f48a0` to `6c40475`.
- [Release notes](https://github.com/marian-nmt/marian-examples/releases)
- [Commits](marian-nmt/marian-examples@58f48a0...6c40475)

---
updated-dependencies:
- dependency-name: examples
  dependency-type: direct:production
...

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