Bump urllib3 from 1.26.17 to 1.26.18 in /modern_time_series_analysis (john-science#28)

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>

Author: dependabot[bot]

modern_time_series_analysis/requirements.txt

@@ -31,7 +31,7 @@ tensorboard==1.14.0
 tensorflow==2.11.1
 tensorflow-estimator==1.14.0
 termcolor==1.1.0
-urllib3==1.26.17
+urllib3==1.26.18
 Werkzeug==2.2.3
 wrapt==1.11.2
 xgboost==0.90