chore(deps): bump dompurify from 2.2.7 to 2.2.8

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 2.2.7 to 2.2.8.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](https://github.com/cure53/DOMPurify/compare/2.2.7...2.2.8)

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

package.json

@@ -66,7 +66,7 @@
     "classnames": "^2.3.1",
     "css.escape": "1.5.1",
     "deep-extend": "0.6.0",
-    "dompurify": "^2.2.7",
+    "dompurify": "^2.2.8",
     "ieee754": "^1.2.1",
     "immutable": "^3.x.x",
     "js-file-download": "^0.4.12",