Bump urllib3 from 1.26.9 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.9 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@1.26.9...1.26.18)

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

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

Author: dependabot[bot]

requirements.txt

@@ -12,5 +12,5 @@ Jinja2==3.1.2
 MarkupSafe==2.1.1
 prometheus-flask-exporter==0.22.3
 requests==2.31.0
-urllib3==1.26.9
+urllib3==1.26.18
 Werkzeug==2.2.3