move detectron2 pin to the most recent tip (#2272)

Summary:
With the existing pin, cpp extension compilation on ROCm fails.

# Testing
`$ pip install --user --verbose -r torchbenchmark/util/framework/detectron2/requirements.txt`

(ensure the extension is successfully built)

Pull Request resolved: #2272

Reviewed By: davidberard98

Differential Revision: D57938441

Pulled By: xuzhao9

fbshipit-source-id: 87f9e131b066a969c8c48afd692639363bddc4a0

Author: tenpercent

torchbenchmark/util/framework/detectron2/requirements.txt

@@ -1,3 +1,3 @@
-git+https://github.com/facebookresearch/detectron2.git@1a4df4d
+git+https://github.com/facebookresearch/detectron2.git@0df2d73d0013db7de629602c23cc120219b4f2b8
 omegaconf==2.3.0
 numpy