Bump markdown from 1.6.2 to 1.6.3

Bumps [markdown](https://github.com/stefan-niedermann/nextcloud-commons) from 1.6.2 to 1.6.3.
- [Release notes](https://github.com/stefan-niedermann/nextcloud-commons/releases)
- [Commits](https://github.com/stefan-niedermann/nextcloud-commons/compare/1.6.2...1.6.3

)

---
updated-dependencies:
- dependency-name: com.github.stefan-niedermann.nextcloud-commons:markdown
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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