Bump xmldom from 0.4.0 to 0.6.0

Bumps [xmldom](https://github.com/xmldom/xmldom) from 0.4.0 to 0.6.0.
- [Release notes](https://github.com/xmldom/xmldom/releases)
- [Changelog](https://github.com/xmldom/xmldom/blob/master/CHANGELOG.md)
- [Commits](xmldom/xmldom@0.4.0...0.6.0)

---
updated-dependencies:
- dependency-name: xmldom
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -29,7 +29,7 @@
     "vue2-leaflet": "^2.5.2",
     "vuetify": "^2.2.11",
     "vuex": "^3.1.2",
-    "xmldom": "^0.4.0"
+    "xmldom": "^0.6.0"
   },
   "devDependencies": {
     "@types/leaflet": "^1.5.5",