Bump urllib3 from 1.26.17 to 1.26.18 (#335)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements-dev.txt

@@ -70,7 +70,7 @@ tqdm==4.48.2
 traitlets==4.3.3
 twine==3.2.0
 ujson==5.4.0
-urllib3==1.26.17
+urllib3==1.26.18
 uvloop==0.17.0
 watchdog==0.10.3
 webencodings==0.5.1

requirements.txt

@@ -8,5 +8,5 @@ python-dateutil==2.8.1
 pytz==2020.1
 requests==2.31.0
 six==1.15.0
-urllib3==1.26.17
+urllib3==1.26.18
 wheel==0.38.1