Bump dompurify from 2.2.3 to 2.5.6 (#309)

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 2.2.3 to 2.5.6.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](cure53/DOMPurify@2.2.3...2.5.6)

---
updated-dependencies:
- dependency-name: dompurify
  dependency-type: indirect
...

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

Author: dependabot[bot]

package-lock.json

@@ -877,8 +877,9 @@ dom-serialize@^2.2.1:
     void-elements "^2.0.0"
 
 dompurify@^2.2.0:
-  version "2.2.3"
-  resolved "https://registry.npmjs.org/dompurify/-/dompurify-2.2.3.tgz"
+  version "2.5.6"
+  resolved "https://registry.yarnpkg.com/dompurify/-/dompurify-2.5.6.tgz#8402b501611eaa7fb3786072297fcbe2787f8592"
+  integrity sha512-zUTaUBO8pY4+iJMPE1B9XlO2tXVYIcEA4SNGtvDELzTSCQO7RzH+j7S180BmhmJId78lqGU2z19vgVx2Sxs/PQ==
 
 [email protected]:
   version "1.1.1"