Bump urllib3 from 2.6.3 to 2.7.0 in /xkcd_download (#552)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.6.3 to 2.7.0.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@2.6.3...2.7.0)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.7.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

xkcd_download/requirements.txt

@@ -5,4 +5,4 @@ idna==3.15
 lxml==6.1.0
 requests==2.33.0
 soupsieve==2.0.1
-urllib3==2.6.3
+urllib3==2.7.0