Bump urllib3 from 1.22 to 1.26.5 in /app/requirements

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.22 to 1.26.5.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.22...1.26.5)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

app/requirements/base.txt

@@ -39,7 +39,7 @@ redis==2.10.6
 requests==2.20.0
 rq==0.12
 SQLAlchemy==1.3.0
-urllib3==1.22
+urllib3==1.26.5
 visitor==0.1.3
 Werkzeug==0.14.1
 wrapt==1.10.11