Bump terser from 4.8.0 to 5.3.1 (#3020)

Bumps [terser](https://github.com/terser/terser) from 4.8.0 to 5.3.1.
- [Release notes](https://github.com/terser/terser/releases)
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/terser/terser/compare/v4.8.0...v5.3.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package-lock.json

@@ -10880,9 +10880,9 @@
       "dev": true
     },
     "terser": {
-      "version": "4.8.0",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-4.8.0.tgz",
-      "integrity": "sha512-EAPipTNeWsb/3wLPeup1tVPaXfIaU68xMnVdPafIL1TV05OhASArYyIfFvnvJCNrR2NIOvDVNNTFRa+Re2MWyw==",
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-5.3.1.tgz",
+      "integrity": "sha512-yD80f4hdwCWTH5mojzxe1q8bN1oJbsK/vfJGLcPZM/fl+/jItIVNKhFIHqqR71OipFWMLgj3Kc+GIp6CeIqfnA==",
       "dev": true,
       "requires": {
         "commander": "^2.20.0",

package.json

@@ -151,7 +151,7 @@
     "rollup": "^2.23.0",
     "stylelint": "^13.6.1",
     "stylelint-config-twbs-bootstrap": "^2.0.3",
-    "terser": "^4.8.0",
+    "terser": "^5.3.1",
     "vnu-jar": "^20.6.30"
   }
 }