Bump nest-asyncio from 1.5.9 to 1.6.0 in /requirements (#367)

Bumps [nest-asyncio](https://github.com/erdewit/nest_asyncio) from 1.5.9 to 1.6.0.
- [Release notes](https://github.com/erdewit/nest_asyncio/releases)
- [Commits](erdewit/nest_asyncio@v1.5.9...v1.6.0)

---
updated-dependencies:
- dependency-name: nest-asyncio
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/requirements_doc.txt

@@ -1,7 +1,7 @@
 Sphinx<8
 ansys-sphinx-theme==0.13.1
 imageio==2.33.1
-nest-asyncio==1.5.9
+nest-asyncio==1.6.0
 notfound==1.0.2
 pypandoc==1.12
 pyvista==0.43.2