build(deps): bump plotly from 6.1.1 to 6.3.1 in /requirements (#326)

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Co-authored-by: Camille Latapie <78221213+clatapie@users.noreply.github.com>

Author: dependabot[bot]

requirements/requirements_doc.txt

@@ -3,7 +3,7 @@ git+https://github.com/ansys/pymapdl.git#egg=ansys-mapdl-core[graphics]
 numpy==2.2.2
 nest-asyncio==1.6.0
 pandas==2.2.3
-plotly==6.1.1
+plotly==6.3.1
 pythreejs==2.4.2
 pyvista[jupyter]==0.46.3