Bump 3rd_party/marian-dev from 7e67124 to 844800e (#382)

Bumps [3rd_party/marian-dev](https://github.com/browsermt/marian-dev) from `7e67124` to `844800e`.
- [Release notes](https://github.com/browsermt/marian-dev/releases)
- [Commits](browsermt/marian-dev@7e67124...844800e)

---
updated-dependencies:
- dependency-name: 3rd_party/marian-dev
  dependency-type: direct:production
...

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