Update serialize-javascript dependency (elastic#52336)

The PR this backports actually updated the resolution from 1.7.0 to
2.1.1. This commit updates the resolution from 1.5.0 to 2.1.1.
I checked the changelog and it doesn't appear that there are any
breaking changes between 1.5.0 and 1.7.0, so this should be safe to
update.

package.json

@@ -95,6 +95,7 @@
     "**/babel-plugin-inline-react-svg/svgo/js-yaml": "^3.13.1",
     "**/grunt/js-yaml": "^3.13.1",
     "**/load-grunt-config/js-yaml": "^3.13.1",
+    "**/serialize-javascript": "^2.1.1",
     "@types/react": "16.3.14"
   },
   "workspaces": {

yarn.lock

@@ -19695,10 +19695,10 @@ sequencify@~0.0.7:
   resolved "https://registry.yarnpkg.com/sequencify/-/sequencify-0.0.7.tgz#90cff19d02e07027fd767f5ead3e7b95d1e7380c"
   integrity sha1-kM/xnQLgcCf9dn9erT57ldHnOAw=
 
-serialize-javascript@^1.4.0:
-  version "1.5.0"
-  resolved "https://registry.yarnpkg.com/serialize-javascript/-/serialize-javascript-1.5.0.tgz#1aa336162c88a890ddad5384baebc93a655161fe"
-  integrity sha512-Ga8c8NjAAp46Br4+0oZ2WxJCwIzwP60Gq1YPgU+39PiTVxyed/iKE/zyZI6+UlVYH5Q4PaQdHhcegIFPZTUfoQ==
+serialize-javascript@^1.4.0, serialize-javascript@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/serialize-javascript/-/serialize-javascript-2.1.1.tgz#952907a04a3e3a75af7f73d92d15e233862048b2"
+  integrity sha512-MPLPRpD4FNqWq9tTIjYG5LesFouDhdyH0EPY3gVK4DRD5+g4aDqdNSzLIwceulo3Yj+PL1bPh6laE5+H6LTcrQ==
 
 serve-index@^1.7.2:
   version "1.9.1"