Bump transformers from 2.11.0 to 4.30.0 in /solvers/enumerative

Bumps [transformers](https://github.com/huggingface/transformers) from 2.11.0 to 4.30.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v2.11.0...v4.30.0)

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

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

Author: dependabot[bot]

solvers/enumerative/requirements.txt

@@ -4,5 +4,5 @@ numpy
 astor
 sklearn
 torch==1.13.1
-transformers==2.11.0
+transformers==4.30.0
 tensorboardX