Bump transformers from 2.3.0 to 4.30.0

Bumps [transformers](https://github.com/huggingface/transformers) from 2.3.0 to 4.30.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v2.3.0...v4.30.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -235,7 +235,7 @@ torchvision==0.4.2
 tornado==6.0.3
 tqdm==4.41.0
 traitlets==4.3.3
-transformers==2.3.0
+transformers==4.30.0
 typed-ast==1.4.0
 urllib3==1.24.3
 us==1.0.0