[DOCS] Update sphinx requirement from <9,>=7 to >=7,<10 (#1411)

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/master/CHANGES.rst)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v7.0.0...v9.1.0)

---
updated-dependencies:
- dependency-name: sphinx
  dependency-version: 9.1.0
  dependency-type: direct:development
...

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

pyproject.toml

@@ -52,7 +52,7 @@ lint = [
     "pylint==4.0.1",
 ]
 docs = [
-    "sphinx>=7,<9",
+    "sphinx>=7,<10",
     "sphinx-rtd-theme>=2,<4",
     "sphinx-book-theme~=1.0",
     "sphinx-copybutton~=0.5",