Bump pelican-sitemap from 1.1.0 to 1.2.0

Bumps [pelican-sitemap](https://github.com/pelican-plugins/sitemap) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/pelican-plugins/sitemap/releases)
- [Changelog](https://github.com/pelican-plugins/sitemap/blob/main/CHANGELOG.md)
- [Commits](pelican-plugins/sitemap@1.1.0...1.2.0)

---
updated-dependencies:
- dependency-name: pelican-sitemap
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -11,7 +11,7 @@ minchin.pelican.plugins.nojekyll==1.2.0
 mdurl==0.1.2
 pelican==4.10.2
 pelican-liquid-tags==1.0.4
-pelican-sitemap==1.1.0
+pelican-sitemap==1.2.0
 Pygments==2.18.0
 python-dateutil==2.9.0.post0
 python-editor==1.0.4