fix(doc): fix doc build (#874)

Co-authored-by: pyansys-ci-bot <[email protected]>

Author: duposyl

doc/source/changelog/874.fixed.md

@@ -0,0 +1 @@
+Fix doc build

pyproject.toml

@@ -104,6 +104,7 @@ tests = [
 doc = [
   "ansys-sphinx-theme==1.6.3",
   "build==1.3.0",
+  "ipykernel==6.31.0",
   "jupyter-server==2.17.0",
   "jupyterlab==4.4.9",
   "jupytext==1.18.1",