chore(deps): Update sphinx requirement from ~=8.1.3 to ~=8.2.1 (openw…

…allet-foundation#3539)

Updates the requirements on [sphinx](https://github.com/sphinx-doc/sphinx) to permit the latest version.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/v8.2.1/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v8.1.3...v8.2.1)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-type: direct:production
...

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

docs/requirements.txt

@@ -1,5 +1,5 @@
 # Defining the exact versions for ReadTheDocs that will make sure things don't break
-sphinx~=8.1.3
+sphinx~=8.2.1
 sphinx-rtd-theme~=3.0.2
 readthedocs-sphinx-search~=0.3.2
 sphinx-notfound-page~=1.1.0