Bump urllib3 from 1.25.8 to 1.26.5 in /server

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.8 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@1.25.8...1.26.5)

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

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

Author: dependabot[bot]

server/requirements.txt

@@ -31,7 +31,7 @@ redis==3.4.1
 sentry-sdk==0.14.3
 six==1.14.0
 typed-ast==1.4.1
-urllib3==1.25.8
+urllib3==1.26.5
 visitor==0.1.3
 WebOb==1.8.6
 Werkzeug==1.0.1