build: bump nbconvert from 7.16.5 to 7.16.6 in the docs-deps group (#1700)

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Author: dependabot[bot]

doc/changelog.d/1700.dependencies.md

@@ -0,0 +1 @@
+bump nbconvert from 7.16.5 to 7.16.6 in the docs-deps group

pyproject.toml

@@ -88,7 +88,7 @@ doc = [
     "jupyter_sphinx==0.5.3",
     "jupytext==1.16.6",
     "myst-parser==4.0.0",
-    "nbconvert==7.16.5",
+    "nbconvert==7.16.6",
     "nbsphinx==0.9.6",
     "notebook==7.3.2",
     "numpydoc==1.8.0",