Update sphinx requirement from <8.2.0,>=7.1.0 to >=7.1.0,<8.3.0

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@v7.1.0...v8.2.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -86,7 +86,7 @@ docs = [
   "nc-time-axis >=1.4.1",
   "pooch >=1.8.0",
   "pygments",
-  "sphinx >=7.1.0,<8.2.0", # pinned until nbsphinx supports sphinx 8.2
+  "sphinx >=7.1.0,<8.3.0", # pinned until nbsphinx supports sphinx 8.2
   "sphinx-autobuild >=2024.4.16",
   "sphinx-autodoc-typehints",
   "sphinx-codeautolink >=0.16.2",