Build(deps): Bump sphinx from 8.0.2 to 8.1.3 (#362)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -47,7 +47,7 @@ tests = [
     "setuptools==75.1.0",
 ]
 doc = [
-    "Sphinx==8.0.2",
+    "Sphinx==8.1.3",
     "ansys-sphinx-theme==1.1.2",
     "sphinx-copybutton==0.5.2",
     "sphinx_design==0.6.1",