Bump urllib3 from 1.26.7 to 1.26.8 in /test

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.7 to 1.26.8.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/1.26.8/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.7...1.26.8)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

test/requirements.ci.txt

@@ -1,7 +1,7 @@
 docker==4.3.1
 requests==2.27.1
 websocket-client==0.57.0
-urllib3==1.26.7
+urllib3==1.26.8
 docker-compose==1.27.4
 grpcio==1.43.0
 protobuf==3.19.1