build(deps): bump pymarkdownlnt from 0.9.18 to 0.9.19

Bumps [pymarkdownlnt](https://github.com/jackdewinter/pymarkdown) from 0.9.18 to 0.9.19.
- [Release notes](https://github.com/jackdewinter/pymarkdown/releases)
- [Changelog](https://github.com/jackdewinter/pymarkdown/blob/main/changelog.md)
- [Commits](jackdewinter/pymarkdown@v0.9.18...v0.9.19)

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

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

requirements-tests.txt

@@ -1,6 +1,6 @@
 -r requirements.txt
 mypy==1.10.0
-pymarkdownlnt==0.9.18
+pymarkdownlnt==0.9.19
 ruff==0.4.2
 sphinx-autobuild==2024.4.16
 yamllint==1.35.1