Bump terser from 4.4.1 to 4.8.1 in /app

Bumps [terser](https://github.com/terser/terser) from 4.4.1 to 4.8.1.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/terser/terser/commits)

---
updated-dependencies:
- dependency-name: terser
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

app/package-lock.json

@@ -2100,9 +2100,9 @@
       "dev": true
     },
     "terser": {
-      "version": "4.4.1",
+      "version": "4.8.1",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-4.4.1.tgz",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-4.8.1.tgz",
-      "integrity": "sha512-e05giplw+8sIYh50qXYHZmr0b76O5dOSm9JwSDebGFLri4ItYzxsnumiAK+yuI56R+H7uIjT9KbVEKNkrprzHw==",
+      "integrity": "sha512-4GnLC0x667eJG0ewJTa6z/yXrbLGv80D9Ru6HIpCQmO+Q4PfEtBFi0ObSckqwL6VyQv/7ENJieXHo2ANmdQwgw==",
       "dev": true,
       "requires": {
         "commander": "^2.20.0",