Update torch requirement from <1.9.0,>=1.7.0 to >=1.7.0,<1.10.0 (#280)

Updates the requirements on [torch](https://github.com/pytorch/pytorch) to permit the latest version.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/master/RELEASE.md)
- [Commits](pytorch/pytorch@v1.7.0...v1.9.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -1,6 +1,6 @@
 git+https://github.com/allenai/allennlp.git@main
 
-torch>=1.7.0,<1.9.0
+torch>=1.7.0,<1.10.0
 
 # For structured prediction.
 conllu==4.4