Bump sphinx-lint from 0.6.7 to 0.6.8

Bumps [sphinx-lint](https://github.com/sphinx-contrib/sphinx-lint) from 0.6.7 to 0.6.8.
- [Release notes](https://github.com/sphinx-contrib/sphinx-lint/releases)
- [Commits](sphinx-contrib/sphinx-lint@v0.6.7...v0.6.8)

---
updated-dependencies:
- dependency-name: sphinx-lint
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -1,7 +1,7 @@
 Sphinx==7.1.1
 furo>=2022.6.4
 jinja2
-sphinx-lint==0.6.7
+sphinx-lint==0.6.8
 sphinx-notfound-page
 sphinx_copybutton>=0.3.3
 sphinxext-opengraph>=0.7.1