build(deps): bump plotly from 6.1.1 to 6.1.2 in /requirements

Bumps [plotly](https://github.com/plotly/plotly.py) from 6.1.1 to 6.1.2.
- [Release notes](https://github.com/plotly/plotly.py/releases)
- [Changelog](https://github.com/plotly/plotly.py/blob/main/CHANGELOG.md)
- [Commits](plotly/plotly.py@v6.1.1...v6.1.2)

---
updated-dependencies:
- dependency-name: plotly
  dependency-version: 6.1.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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==6.1.2
 pythreejs==2.4.2
 pyvista[jupyter]==0.45.2