Bump markdown from 3.7 to 3.8 (#1031)

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.7 to 3.8.
- [Release notes](https://github.com/Python-Markdown/markdown/releases)
- [Changelog](https://github.com/Python-Markdown/markdown/blob/master/docs/changelog.md)
- [Commits](Python-Markdown/markdown@3.7...3.8)

---
updated-dependencies:
- dependency-name: markdown
  dependency-version: '3.8'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@ Flask==3.1.0
 flask-talisman==1.1.0
 google-cloud-storage==3.1.0
 gunicorn==23.0.0
-markdown==3.7
+markdown==3.8
 pytest==8.3.5
 pytest-watch==4.2.0
 pytest-cov==6.1.1