fix: packages/blockchain-wallet-v4-frontend/package.json to reduce vu…

…lnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-POSTCSS-1090595

packages/blockchain-wallet-v4-frontend/package.json

@@ -139,7 +139,7 @@
     "reselect": "4.0.0",
     "resize-observer-polyfill": "1.5.1",
     "rxjs": "6.5.2",
-    "sanitize-html": "1.25.0",
+    "sanitize-html": "2.0.0",
     "slick-carousel": "1.8.1",
     "styled-components": "4.4.1",
     "uuid": "8.3.2",