Bump urllib3 from 1.24.2 to 1.26.19 in /infra/python/deps

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.24.2 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/1.24.2...1.26.19)

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

Signed-off-by: dependabot[bot] <support@github.com>

infra/python/deps/requirements.txt

@@ -55,7 +55,7 @@ pywebhdfs == 0.3.2
 requests == 2.21.0
   chardet == 3.0.4
   idna == 2.8
-  urllib3 == 1.24.2
+  urllib3 == 1.26.19
   certifi == 2020.12.5
 sasl == 0.2.1
 sh == 1.11