build(deps): bump dompurify from 2.4.0 to 2.5.6

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 2.4.0 to 2.5.6.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](cure53/DOMPurify@2.4.0...2.5.6)

---
updated-dependencies:
- dependency-name: dompurify
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -38,7 +38,7 @@
     "@taiga-ui/kit": "^3.7.1",
     "@taiga-ui/styles": "^3.7.1",
     "@tinkoff/ng-dompurify": "4.0.0",
-    "dompurify": "2.4.0",
+    "dompurify": "2.5.6",
     "ngx-highlightjs": "^7.0.1",
     "rxjs": "~7.5.7",
     "tslib": "^2.4.0",