Update sphinx requirement from <7.4 to <7.5 (opensearch-project#788)

* Update sphinx requirement from <7.4 to <7.5

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@v0.1.61611...v7.4.7)

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

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

* Update changelog

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

---------

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

CHANGELOG.md

@@ -21,6 +21,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Security
 ### Dependencies
 - Bump `pytest-asyncio` from <=0.23.7 to <=0.23.8 ([#787](https://github.com/opensearch-project/opensearch-py/pull/787))
+- Bump `sphinx` from <7.4 to <7.5 ([#788](https://github.com/opensearch-project/opensearch-py/pull/788))
 
 ## [2.6.0]
 ### Added

dev-requirements.txt

@@ -2,7 +2,7 @@ requests>=2, <3
 pytest
 pytest-cov
 coverage
-sphinx<7.4
+sphinx<7.5
 sphinx_rtd_theme
 jinja2
 pytz