build: bump ansys-sphinx-theme from 1.1.2 to 1.1.6 in the core group across 1 directory (#3496)

* build: bump ansys-sphinx-theme in the core group across 1 directory

Bumps the core group with 1 update in the / directory: [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme).


Updates `ansys-sphinx-theme` from 1.1.2 to 1.1.6
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v1.1.2...v1.1.6)

---
updated-dependencies:
- dependency-name: ansys-sphinx-theme
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: core
...

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

* chore: adding changelog file 3496.dependencies.md [dependabot-skip]

---------

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/3496.dependencies.md

@@ -0,0 +1 @@
+build: bump ansys-sphinx-theme from 1.1.2 to 1.1.6 in the core group across 1 directory

pyproject.toml

@@ -77,7 +77,7 @@ doc = [
     "ansys-dpf-core==0.10.1",
     "ansys-mapdl-reader==0.54.1",
     "ansys-tools-visualization-interface==0.4.5",
-    "ansys-sphinx-theme==1.1.5",
+    "ansys-sphinx-theme==1.1.6",
     "grpcio==1.67.0",
     "imageio-ffmpeg==0.5.1",
     "imageio==2.36.0",