Bump urllib3 from 1.25.9 to 1.26.19 in /__tests__/data (#895)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.9 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/1.25.9...1.26.19)

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

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

__tests__/data/requirements-linux.txt

@@ -8,5 +8,5 @@ packaging==20.7
 pdf2image==1.12.1
 Pygments==2.6.1
 requests==2.24.0
-urllib3==1.25.10
+urllib3==1.26.19
 xlrd==1.2.0