Bump sphinx-intl from 2.3.2 to 2.4.0

Bumps [sphinx-intl](https://github.com/sphinx-doc/sphinx-intl) from 2.3.2 to 2.4.0.
- [Release notes](https://github.com/sphinx-doc/sphinx-intl/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx-intl/blob/master/CHANGES.rst)
- [Commits](sphinx-doc/sphinx-intl@2.3.2...2.4.0)

---
updated-dependencies:
- dependency-name: sphinx-intl
  dependency-version: 2.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,5 +1,5 @@
 Sphinx==9.1.0
 sphinx-rtd-theme==3.1.0
-sphinx-intl==2.3.2
+sphinx-intl==2.4.0
 breathe==4.36.0
 PyYAML==6.0.3