Bump @types/sanitize-html in /LearningHub.Nhs.WebUI

Bumps [@types/sanitize-html](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/sanitize-html) from 2.13.0 to 2.15.0.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/sanitize-html)

---
updated-dependencies:
- dependency-name: "@types/sanitize-html"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

LearningHub.Nhs.WebUI/package-lock.json

@@ -67,7 +67,7 @@
     "@types/js-cookie": "2.2.1",
     "@types/lodash": "4.17.16",
     "@types/openseadragon": "^2.4.5",
-    "@types/sanitize-html": "^2.13.0",
+    "@types/sanitize-html": "^2.15.0",
     "@types/vuelidate": "^0.7.22",
     "@vue/babel-preset-app": "4.5.19",
     "@vue/test-utils": "^1.3.6",