build(deps): bump nbsphinx in the doc-dependencies group

Bumps the doc-dependencies group with 1 update: [nbsphinx](https://github.com/spatialaudio/nbsphinx).


Updates `nbsphinx` from 0.9.6 to 0.9.7
- [Release notes](https://github.com/spatialaudio/nbsphinx/releases)
- [Changelog](https://github.com/spatialaudio/nbsphinx/blob/master/NEWS.rst)
- [Commits](spatialaudio/nbsphinx@0.9.6...0.9.7)

---
updated-dependencies:
- dependency-name: nbsphinx
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: doc-dependencies
...

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

Author: dependabot[bot]

pyproject.toml

@@ -45,7 +45,7 @@ doc = [
     "ansys-sphinx-theme==1.3.2",
     "jupyter_sphinx==0.5.3",
     "jupytext==1.16.7",
-    "nbsphinx==0.9.6",
+    "nbsphinx==0.9.7",
     "numpydoc==1.8.0",
     "sphinx==8.2.3",
     "sphinx-autoapi==3.6.0",