chore (deps): bump dompurify from 3.3.3 to 3.4.0 (gchq#2321)

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Author: dependabot[bot]

package-lock.json

@@ -121,7 +121,7 @@
     "d3": "7.9.0",
     "d3-hexbin": "^0.2.2",
     "diff": "^5.2.2",
-    "dompurify": "^3.3.3",
+    "dompurify": "^3.4.0",
     "es6-promisify": "^7.0.0",
     "escodegen": "^2.1.0",
     "esprima": "^4.0.1",