Bump terser from 4.3.1 to 4.8.1 in /web/gui2

Bumps [terser](https://github.com/terser/terser) from 4.3.1 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: direct:development
...

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

web/gui2/package.json

@@ -54,7 +54,7 @@
     "rollup": "2.3.4",
     "@rollup/plugin-commonjs": "^14.0.0",
     "@rollup/plugin-node-resolve": "^8.4.0",
-    "terser": "4.3.1",
+    "terser": "4.8.1",
     "typescript": "3.9.7"
   }
 }

web/gui2/yarn.lock

@@ -8887,10 +8887,10 @@ terser-webpack-plugin@^1.4.3:
     webpack-sources "^1.4.0"
     worker-farm "^1.7.0"
 
-terser@4.3.1:
-  version "4.3.1"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.3.1.tgz#09820bcb3398299c4b48d9a86aefc65127d0ed65"
-  integrity sha512-pnzH6dnFEsR2aa2SJaKb1uSCl3QmIsJ8dEkj0Fky+2AwMMcC9doMqLOQIH6wVTEKaVfKVvLSk5qxPBEZT9mywg==
+terser@4.8.1, terser@^4.1.2:
+  version "4.8.1"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.1.tgz#a00e5634562de2239fd404c649051bf6fc21144f"
+  integrity sha512-4GnLC0x667eJG0ewJTa6z/yXrbLGv80D9Ru6HIpCQmO+Q4PfEtBFi0ObSckqwL6VyQv/7ENJieXHo2ANmdQwgw==
   dependencies:
     commander "^2.20.0"
     source-map "~0.6.1"
@@ -8905,15 +8905,6 @@ terser@5.3.0:
     source-map "~0.6.1"
     source-map-support "~0.5.12"
 
-terser@^4.1.2:
-  version "4.8.0"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.0.tgz#63056343d7c70bb29f3af665865a46fe03a0df17"
-  integrity sha512-EAPipTNeWsb/3wLPeup1tVPaXfIaU68xMnVdPafIL1TV05OhASArYyIfFvnvJCNrR2NIOvDVNNTFRa+Re2MWyw==
-  dependencies:
-    commander "^2.20.0"
-    source-map "~0.6.1"
-    source-map-support "~0.5.12"
-
 terser@^5.0.0:
   version "5.5.1"
   resolved "https://registry.yarnpkg.com/terser/-/terser-5.5.1.tgz#540caa25139d6f496fdea056e414284886fb2289"