chore(deps): update dependency mutationobserver-shim to v0.3.7 (#633)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package-lock.json

@@ -70,7 +70,7 @@
     "jest": "26.0.1",
     "jest-serializer-vue": "2.0.2",
     "mini-css-extract-plugin": "0.9.0",
-    "mutationobserver-shim": "0.3.5",
+    "mutationobserver-shim": "0.3.7",
     "node-sass": "4.14.1",
     "normalize.css": "8.0.1",
     "optimize-css-assets-webpack-plugin": "5.0.3",