5793 Avoid using sphinx 6.0.0 (#5794)

Fixes #5793 .

### Description

This PR provides a workaround for the incompatible sphinx 6.0.0

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

Signed-off-by: Yiheng Wang <vennw@nvidia.com>
Signed-off-by: Wenqi Li <wenqil@nvidia.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Wenqi Li <wenqil@nvidia.com>

docs/source/conf.py

@@ -118,6 +118,7 @@ def generate_apidocs(*args):
     "show_toc_level": 1,
     "footer_items": ["copyright"],
     "navbar_align": "content",
+    "logo": {"image_light": "../images/MONAI-logo-color.png", "image_dark": "../images/MONAI-logo-color.png"},
 }
 html_context = {
     "github_user": "Project-MONAI",