Bump pelican from 4.11.0.post0 to 4.12.0

Bumps [pelican](https://github.com/getpelican/pelican) from 4.11.0.post0 to 4.12.0.
- [Release notes](https://github.com/getpelican/pelican/releases)
- [Changelog](https://github.com/getpelican/pelican/blob/main/docs/changelog.rst)
- [Commits](https://github.com/getpelican/pelican/commits/4.12.0)

---
updated-dependencies:
- dependency-name: pelican
  dependency-version: 4.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 Jinja2==3.1.6
 Markdown==3.10.2
-Pelican[markdown]==4.11.0.post0
+Pelican[markdown]==4.12.0
 pelican-linkclass==2.1.6
 pelican-liquid-tags==1.0.4