chore(deps): Bump dompurify from 3.3.3 to 3.4.0 in /build/frontend-legacy

Dependabot couldn't find the original pull request head commit, e377206.

Author: dependabot[bot]

build/frontend-legacy/package-lock.json

@@ -61,7 +61,7 @@
     "crypto-browserify": "^3.12.1",
     "davclient.js": "nextcloud-deps/davclient.js#59d7777d7fe290c5f1fd74a58e7eb529b63e153d",
     "debounce": "^3.0.0",
-    "dompurify": "^3.3.1",
+    "dompurify": "^3.4.0",
     "escape-html": "^1.0.3",
     "focus-trap": "^8.0.0",
     "handlebars": "^4.7.8",