Bump sanitize-html from 2.14.0 to 2.15.0 in /LearningHub.Nhs.WebUI (#1043)

Bumps [sanitize-html](https://github.com/apostrophecms/sanitize-html) from 2.14.0 to 2.15.0.
- [Changelog](https://github.com/apostrophecms/sanitize-html/blob/main/CHANGELOG.md)
- [Commits](apostrophecms/sanitize-html@2.14.0...2.15.0)

---
updated-dependencies:
- dependency-name: sanitize-html
  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>

Author: dependabot[bot]

LearningHub.Nhs.WebUI/package-lock.json

@@ -37,7 +37,7 @@
     "nhsuk-frontend": "^7.1.0",
     "node": "^14.0.0",
     "openseadragon": "^2.4.2",
-    "sanitize-html": "^2.14.0",
+    "sanitize-html": "^2.15.0",
     "save": "^2.9.0",
     "ts-debounce": "2.3.0",
     "tus-js-client": "^2.3.2",