chore(deps): bump prosemirror-markdown from 1.11.0 to 1.12.0 (#6525)

Bumps [prosemirror-markdown](https://github.com/prosemirror/prosemirror-markdown) from 1.11.0 to 1.12.0.
- [Changelog](https://github.com/ProseMirror/prosemirror-markdown/blob/master/CHANGELOG.md)
- [Commits](https://github.com/prosemirror/prosemirror-markdown/compare/1.11.0...1.12.0)

---
updated-dependencies:
- dependency-name: prosemirror-markdown
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -168,7 +168,7 @@
     "prosemirror-history": "^1.3.2",
     "prosemirror-inputrules": "^1.3.0",
     "prosemirror-keymap": "^1.2.2",
-    "prosemirror-markdown": "^1.11.0",
+    "prosemirror-markdown": "^1.12.0",
     "prosemirror-model": "^1.19.2",
     "prosemirror-schema-list": "^1.3.0",
     "prosemirror-state": "^1.4.3",