maint: bump nbsphinx from 0.9.5 to 0.9.6 (#136)

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

Author: dependabot[bot]

requirements/requirements_doc.txt

@@ -3,7 +3,7 @@ jupyterlab==4.3.1
 jupytext==1.16.6
 jupyter-server==2.15.0
 myst-parser==4.0.0
-nbsphinx==0.9.5
+nbsphinx==0.9.6
 numpydoc==1.8.0
 nbconvert==7.16.4
 sphinx==8.1.3