Bump urllib3 from 1.26.15 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.15 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@1.26.15...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

@@ -30,7 +30,7 @@ starlette==0.27.0
 typing==3.7.4.3
 typing_extensions==4.5.0
 ujson==5.7.0
-urllib3==1.26.15
+urllib3==1.26.18
 uvicorn==0.21.1
 uvloop==0.17.0
 watchfiles==0.19.0