Bump sphinx-wagtail-theme from 6.2.0 to 6.3.0

Bumps [sphinx-wagtail-theme](https://github.com/wagtail/sphinx_wagtail_theme) from 6.2.0 to 6.3.0.
- [Release notes](https://github.com/wagtail/sphinx_wagtail_theme/releases)
- [Changelog](https://github.com/wagtail/sphinx-wagtail-theme/blob/main/CHANGELOG.md)
- [Commits](wagtail/sphinx-wagtail-theme@v6.2.0...v6.3.0)

---
updated-dependencies:
- dependency-name: sphinx-wagtail-theme
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pyproject.toml

@@ -42,7 +42,7 @@ coverage = "7.4.3"
 mypy = "1.8.0"
 setuptools = ">65.5.1"
 sphinx = "7.2.6"
-sphinx-wagtail-theme = "6.2.0"
+sphinx-wagtail-theme = "6.3.0"
 sphinxcontrib-bibtex = "2.6.2"
 sphinx-autoapi = "3.0.0"
 sympy = "1.12"