Bump markdownz from 8.0.7 to 8.1.2 (#6834)

Bumps [markdownz](https://github.com/zooniverse/markdownz) from 8.0.7 to 8.1.2.
- [Release notes](https://github.com/zooniverse/markdownz/releases)
- [Changelog](https://github.com/zooniverse/markdownz/blob/master/CHANGELOG.md)
- [Commits](zooniverse/markdownz@v8.0.7...v8.1.2)

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

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

package.json

@@ -15,7 +15,7 @@
     "hash.js": "~1.1.7",
     "history": "~3.3.0",
     "lodash": "~4.17.11",
-    "markdownz": "~8.0.7",
+    "markdownz": "~8.1.2",
     "modal-form": "~2.9",
     "moment": "~2.29.0",
     "panoptes-client": "~5.5.6",