Bump urllib3 from 1.26.18 to 1.26.19 in /examples/research_projects/visual_bert (#31472)

Bump urllib3 in /examples/research_projects/visual_bert

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.18 to 1.26.19.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/1.26.19/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/1.26.18...1.26.19)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
...

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

examples/research_projects/visual_bert/requirements.txt

@@ -90,7 +90,7 @@ tornado==6.4.1
 tqdm==4.66.3
 traitlets
 git+https://github.com/huggingface/transformers.git
-urllib3==1.26.18
+urllib3==1.26.19
 wcwidth==0.2.5
 webencodings==0.5.1
 wget==3.2