[issues template] update deepspeed owners
add the right contact for deepspeed@accelerate

_The documentation is not available anymore as the PR was closed or merged._<|||||>That's an excellent idea, Sylvain. Added.<|||||>The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_21027). All of your documentation changes will be reflected on that endpoint.