Bump urllib3 from 1.26.6 to 1.26.18

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.6 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@1.26.6...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

@@ -29,6 +29,6 @@ six==1.16.0
 tenacity==8.0.1
 tqdm==4.62.1
 twine==3.4.2
-urllib3==1.26.6
+urllib3==1.26.18
 webencodings==0.5.1
 zipp==3.5.0

requirements_dev.txt

@@ -29,6 +29,6 @@ six==1.16.0
 tenacity==8.0.1
 tqdm==4.62.1
 twine==3.4.2
-urllib3==1.26.6
+urllib3==1.26.18
 webencodings==0.5.1
 zipp==3.5.0