Bump pypandoc from 1.7.2 to 1.7.4 in /requirements (#985)

Bumps [pypandoc](https://github.com/bebraw/pypandoc) from 1.7.2 to 1.7.4.
- [Release notes](https://github.com/bebraw/pypandoc/releases)
- [Changelog](https://github.com/NicklasTegner/pypandoc/blob/master/release.md)
- [Commits](JessicaTegner/pypandoc@v1.7.2...v1.7.4)

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

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

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

Author: dependabot[bot]

requirements/requirements_docs.txt

@@ -9,7 +9,7 @@ numpydoc==1.2
 pandas==1.4.1
 plotly==5.6.0
 pyansys_sphinx_theme==0.2.3
-pypandoc==1.7.2
+pypandoc==1.7.4
 pytest-sphinx==0.3.1
 pythreejs==2.3.0
 pyvista==0.33.3