Bump panflute from 2.3.0 to 2.3.1 (#2563)

Bumps [panflute](https://github.com/sergiocorreia/panflute) from 2.3.0 to 2.3.1.
- [Release notes](https://github.com/sergiocorreia/panflute/releases)
- [Commits](https://github.com/sergiocorreia/panflute/commits)

---
updated-dependencies:
- dependency-name: panflute
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

base-requirements.txt

@@ -52,5 +52,5 @@ django-extensions==3.1.4
 django-import-export==2.7.1
 
 pypandoc==1.12
-panflute==2.3.0
+panflute==2.3.1
 Unidecode==1.3.8