build(deps): bump urllib3 from 1.26.16 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.16 to 1.26.18.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.16...1.26.18)

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

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

requirements.txt

@@ -67,7 +67,7 @@ strict-rfc3339==0.7       # via jsonschema
 swagger-spec-validator==3.0.3  # via bravado-core
 typing-extensions==4.8.0  # via alembic, bravado, kombu, swagger-spec-validator
 tzdata==2023.3            # via backports-zoneinfo
-urllib3==1.26.16          # via google-auth, kubernetes, requests
+urllib3==1.26.18          # via google-auth, kubernetes, requests
 uwsgi==2.0.22             # via reana-workflow-controller (setup.py)
 uwsgi-tools==1.1.1        # via reana-workflow-controller (setup.py)
 uwsgitop==0.11            # via reana-workflow-controller (setup.py)