Bump markupsafe from 2.1.4 to 2.1.5

Bumps [markupsafe](https://github.com/pallets/markupsafe) from 2.1.4 to 2.1.5.
- [Release notes](https://github.com/pallets/markupsafe/releases)
- [Changelog](https://github.com/pallets/markupsafe/blob/main/CHANGES.rst)
- [Commits](pallets/markupsafe@2.1.4...2.1.5)

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

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

requirements.txt

@@ -8,7 +8,7 @@ livereload==2.6.3
 lunr==0.7.0.post1
 Markdown==3.5.2
 markdown-include==0.8.1
-MarkupSafe==2.1.4
+MarkupSafe==2.1.5
 mkdocs==1.5.3
 mkdocs-cinder==1.2.0
 mkdocs-minify-plugin==0.8.0