build(deps): bump pypandoc from 1.15 to 1.16.2 in /requirements

Bumps [pypandoc](https://github.com/JessicaTegner/pypandoc) from 1.15 to 1.16.2.
- [Release notes](https://github.com/JessicaTegner/pypandoc/releases)
- [Changelog](https://github.com/JessicaTegner/pypandoc/blob/master/release.md)
- [Commits](JessicaTegner/pypandoc@v1.15...v1.16.2)

---
updated-dependencies:
- dependency-name: pypandoc
  dependency-version: 1.16.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/requirements_docs.txt

@@ -5,7 +5,7 @@ imageio==2.37.0
 imageio-ffmpeg==0.6.0
 jupyter_sphinx==0.5.3
 nbsphinx==0.9.5
-pypandoc==1.15
+pypandoc==1.16.2
 pytest-sphinx==0.6.3
 pyvista==0.46.3
 sphinx==8.2.3