Bump urllib3 from 1.26.17 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.17 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@1.26.17...1.26.18)

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

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

Author: dependabot[bot]

requirements.txt

@@ -85,7 +85,7 @@ termcolor==1.1.0
 threadpoolctl==2.1.0
 toml==0.10.2
 typing-extensions==3.7.4.3
-urllib3==1.26.17
+urllib3==1.26.18
 uvicorn==0.13.4
 uvloop==0.14.0
 wcwidth==0.2.5