Bump urllib3 from 1.25.11 to 1.26.4 (#39)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.11 to 1.26.4.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/1.26.4/CHANGES.rst)
- [Commits](urllib3/urllib3@1.25.11...1.26.4)

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