Build(deps): Bump urllib3 from 1.26.17 to 1.26.18 in /mdl-ref-server (#…

…388)

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

mdl-ref-server/requirements.txt

@@ -13,4 +13,4 @@ PyYAML==5.4.1
 requests==2.31.0
 shellescape==3.8.1
 tornado==6.3.3
-urllib3==1.26.17
+urllib3==1.26.18