build: bump sphinx from 8.1.0 to 8.1.3 in the docs-deps group (#1479)

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

Author: dependabot[bot]

doc/changelog.d/1479.dependencies.md

@@ -0,0 +1 @@
+bump sphinx from 8.1.0 to 8.1.3 in the docs-deps group

pyproject.toml

@@ -99,7 +99,7 @@ doc = [
     "scipy==1.14.1",
     "semver==3.0.2",
     "six==1.16.0",
-    "sphinx==8.1.0",
+    "sphinx==8.1.3",
     "sphinx-autodoc-typehints==2.5.0",
     "sphinx-copybutton==0.5.2",
     "sphinx-jinja==2.0.2",