chore: Bump xmldom to 0.8.0

Switching from package `xmldom` to `@xmldom/xmldom`, which resolves the security issue present in latest xmldom version 0.6.0:
GHSA-5fg8-2547-mr8q

The reason is that the maintainers were forced to switch to a scoped package since 0.7.0:
 xmldom/xmldom#271

No matter what version of node I used to try and run the normal `npm install`, I always received a warning about either old package lock file format or newer lock file version format.
So to avoid to many unrelated changes, I disabled the `postinstall` step locally and installed the root level using node v12 and the `mbTest` folder using node v16.
- When running the `npm run test` on the root level using node v12, there is a single failing test, but running them with node v16 works.So let's see what happens on CircleCI.

I'm happy to fix any regression we introduced, I just need help to understand how exactly the xmldom upgrade influences the failing test.

I'm one of the xmldom maintainers. Don't hesitate to ask me questions.

mbTest/package.json

@@ -23,6 +23,7 @@
         "airplane": "MB_AIRPLANE_MODE=true npm test"
     },
     "dependencies": {
+        "@xmldom/xmldom": "0.8.0",
         "express": "4.17.1",
         "fs-extra": "10.0.0",
         "hpagent": "0.1.1",
@@ -34,7 +35,6 @@
         "nodemailer": "6.6.3",
         "safe-stable-stringify": "1.1.1",
         "w3cjs": "0.4.0",
-        "xmldom": "0.6.0",
         "xpath": "0.0.32"
     },
     "engines": {

mbTest/web/feedTest.js

@@ -4,7 +4,7 @@ const assert = require('assert'),
     api = require('../api').create(),
     httpClient = require('../baseHttpClient').create('http'),
     xpath = require('xpath'),
-    DOMParser = require('xmldom').DOMParser,
+    DOMParser = require('@xmldom/xmldom').DOMParser,
     timeout = parseInt(process.env.MB_SLOW_TEST_TIMEOUT || 3000);
 
 function entryCount (body) {

package.json

@@ -53,6 +53,7 @@
     "service virtualization"
   ],
   "dependencies": {
+    "@xmldom/xmldom": "0.8.0",
     "cors": "2.8.5",
     "csv-parse": "4.16.3",
     "ejs": "3.1.6",
@@ -71,7 +72,6 @@
     "safe-stable-stringify": "1.1.1",
     "smtp-server": "3.9.0",
     "winston": "3.3.3",
-    "xmldom": "0.6.0",
     "xpath": "0.0.32",
     "yargs": "17.1.1"
   },

src/models/xpath.js

@@ -51,7 +51,7 @@ function nodeValue (node) {
  */
 function select (selector, ns, possibleXML, logger) {
     const xpath = require('xpath'),
-        DOMParser = require('xmldom').DOMParser,
+        DOMParser = require('@xmldom/xmldom').DOMParser,
         parser = new DOMParser({
             errorHandler: (level, message) => {
                 const warn = (logger || {}).warn || (() => {});