fix: upgrade @xmldom/xmldom from 0.8.10 to 0.9.8

Snyk has created this PR to upgrade @xmldom/xmldom from 0.8.10 to 0.9.8.

See this package in npm:
@xmldom/xmldom

See this project in Snyk:
https://app.snyk.io/org/mountebank-testing/project/0299f531-dd33-4a40-b36d-f6244d3c2a9c?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -53,7 +53,7 @@
     "service virtualization"
   ],
   "dependencies": {
-    "@xmldom/xmldom": "0.8.10",
+    "@xmldom/xmldom": "0.9.8",
     "cors": "2.8.5",
     "csv-parse": "5.5.3",
     "ejs": "3.1.10",