Update sphinx requirement from <8.0.0,>=7.2.6 to >=7.2.6,<9.0.0

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/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx@v7.2.6...v8.2.3)

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

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

Author: dependabot[bot]

pyproject.toml

@@ -6,7 +6,7 @@ authors = [
 license = {text = "Apache License, Version 2.0"}
 requires-python = "<4.0,>=3.13"
 dependencies = [
-    "Sphinx<8.0.0,>=7.2.6",
+    "Sphinx>=7.2.6,<9.0.0",
     "ablog<1.0.0,>=0.11.6",
     "pydata-sphinx-theme<1.0.0,>=0.15.2",
     "myst-parser[linkify]<3.0.0,>=2.0.0",