Bump 3rd_party/marian-dev from 780df27 to 11c6ae7 (#466)

Bumps [3rd_party/marian-dev](https://github.com/browsermt/marian-dev) from `780df27` to `11c6ae7`.
- [Commits](browsermt/marian-dev@780df27...11c6ae7)

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

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