Bump terser from 4.6.11 to 4.8.1

Bumps [terser](https://github.com/terser/terser) from 4.6.11 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>

package-lock.json

@@ -5441,15 +5441,15 @@
       }
     },
     "jszip": {
-      "version": "3.10.1",
-      "resolved": "https://registry.npmjs.org/jszip/-/jszip-3.10.1.tgz",
-      "integrity": "sha512-xXDvecyTpGLrqFrvkrUSoxxfJI5AH7U8zxxtVclpsUtMCq4JQ290LY8AW5c7Ggnr/Y/oK+bQMbqK2qmtk3pN4g==",
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/jszip/-/jszip-3.4.0.tgz",
+      "integrity": "sha512-gZAOYuPl4EhPTXT0GjhI3o+ZAz3su6EhLrKUoAivcKqyqC7laS5JEv4XWZND9BgcDcF83vI85yGbDmDR6UhrIg==",
       "dev": true,
       "requires": {
         "lie": "~3.3.0",
         "pako": "~1.0.2",
         "readable-stream": "~2.3.6",
-        "setimmediate": "^1.0.5"
+        "set-immediate-shim": "~1.0.1"
       }
     },
     "karma": {
@@ -8763,6 +8763,12 @@
       "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
       "dev": true
     },
+    "set-immediate-shim": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/set-immediate-shim/-/set-immediate-shim-1.0.1.tgz",
+      "integrity": "sha1-SysbJ+uAip+NzEgaWOXlb1mfP2E=",
+      "dev": true
+    },
     "set-value": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/set-value/-/set-value-2.0.1.tgz",
@@ -9682,9 +9688,9 @@
       }
     },
     "terser": {
-      "version": "4.6.11",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-4.6.11.tgz",
-      "integrity": "sha512-76Ynm7OXUG5xhOpblhytE7X58oeNSmC8xnNhjWVo8CksHit0U0kO4hfNbPrrYwowLWFgM2n9L176VNx2QaHmtA==",
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-4.8.1.tgz",
+      "integrity": "sha512-4GnLC0x667eJG0ewJTa6z/yXrbLGv80D9Ru6HIpCQmO+Q4PfEtBFi0ObSckqwL6VyQv/7ENJieXHo2ANmdQwgw==",
       "dev": true,
       "requires": {
         "commander": "^2.20.0",