Bump ansys-dpf-core, pandas and ansys-sphinx-theme (#1966)

Bumps [ansys-dpf-core](https://github.com/pyansys/pydpf-core), [pandas](https://github.com/pandas-dev/pandas) and [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme). These dependencies needed to be updated together.

Updates `ansys-dpf-core` from 0.7.4 to 0.8.0
- [Release notes](https://github.com/pyansys/pydpf-core/releases)
- [Commits](ansys/pydpf-core@v0.7.4...v0.8.0)

Updates `pandas` from 1.5.3 to 2.0.0
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Changelog](https://github.com/pandas-dev/pandas/blob/main/RELEASE.md)
- [Commits](pandas-dev/pandas@v1.5.3...v2.0.0)

Updates `ansys-sphinx-theme` from 0.9.5 to 0.9.6
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v0.9.5...v0.9.6)

Author: pyansys-ci-bot

pyproject.toml

@@ -53,11 +53,11 @@ classifiers = [
 
 [project.optional-dependencies]
 tests = [
-    "ansys-dpf-core==0.7.4",
+    "ansys-dpf-core==0.8.0",
     "autopep8==2.0.2",
     "matplotlib==3.7.1",
     "scipy==1.10.1",
-    "pandas==1.5.3",
+    "pandas==2.0.0",
     "pytest==7.2.2",
     "pytest-cov==4.0.0",
     "pyvista==0.38.5",
@@ -67,17 +67,17 @@ tests = [
 ]
 doc = [
     "sphinx==5.3.0",
-    "ansys-dpf-core==0.7.4",
+    "ansys-dpf-core==0.8.0",
     "ansys-mapdl-reader==0.52.11",
-    "ansys-sphinx-theme==0.9.5",
+    "ansys-sphinx-theme==0.9.6",
     "grpcio==1.51.1",
     "imageio-ffmpeg==0.4.8",
     "imageio==2.27.0",
     "jupyter_sphinx==0.4.0",
     "jupyterlab>=3.2.8",
     "matplotlib==3.7.1",
     "numpydoc==1.5.0",
-    "pandas==1.5.3",
+    "pandas==2.0.0",
     "plotly==5.14.0",
     "pypandoc==1.11",
     "pytest-sphinx==0.5.0",