Update transformers requirement from <4.9,>=4.1 to >=4.1,<4.10 (#5326)

Updates the requirements on [transformers](https://github.com/huggingface/transformers) to permit the latest version.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@v4.1.0...v4.9.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dirk Groeneveld <dirkg@allenai.org>

setup.py

@@ -66,7 +66,7 @@
         "scikit-learn",
         "scipy",
         "pytest",
-        "transformers>=4.1,<4.9",
+        "transformers>=4.1,<4.10",
         "sentencepiece",
         "dataclasses;python_version<'3.7'",
         "filelock>=3.0,<3.1",