Bump transformers in /research/information_retrieval/doc2query

Bumps [transformers](https://github.com/huggingface/transformers) from 4.7.0 to 4.50.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.7.0...v4.50.0)

---
updated-dependencies:
- dependency-name: transformers
  dependency-version: 4.50.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

research/information_retrieval/doc2query/requirements.txt

@@ -124,7 +124,7 @@ torch==1.8.0
 tornado==6.3.2
 tqdm==4.61.1
 traitlets==5.0.5
-transformers==4.7.0
+transformers==4.50.0
 typer==0.3.2
 typing-extensions==3.10.0.0
 urllib3==1.26.18