Bump urllib3 from 1.26.10 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.10 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@1.26.10...1.26.18)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: indirect
...

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

Author: dependabot[bot]

requirements.txt

@@ -46,7 +46,7 @@ six==1.16.0
     #   xml2rfc
 sortedcontainers==2.4.0
     # via intervaltree
-urllib3==1.26.10
+urllib3==1.26.18
     # via requests
 webencodings==0.5.1
     # via html5lib