Bump terser-webpack-plugin in /server/src/main/webapp/WEB-INF/rails

Bumps [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) from 2.3.3 to 2.3.4.
- [Release notes](https://github.com/webpack-contrib/terser-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/terser-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/terser-webpack-plugin@v2.3.3...v2.3.4)

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

server/src/main/webapp/WEB-INF/rails/package.json

@@ -125,7 +125,7 @@
     "speed-measure-webpack-plugin": "^1.3.1",
     "stats-webpack-plugin": "^0.7.0",
     "style-loader": "^1.1.3",
-    "terser-webpack-plugin": "^2.3.3",
+    "terser-webpack-plugin": "^2.3.4",
     "thread-loader": "^2.1.3",
     "ts-loader": "^6.2.1",
     "ts-node": "^8.6.2",

server/src/main/webapp/WEB-INF/rails/yarn.lock

@@ -8582,10 +8582,10 @@ terser-webpack-plugin@^1.4.3:
     webpack-sources "^1.4.0"
     worker-farm "^1.7.0"
 
-terser-webpack-plugin@^2.3.3:
-  version "2.3.3"
-  resolved "https://registry.yarnpkg.com/terser-webpack-plugin/-/terser-webpack-plugin-2.3.3.tgz#b89043168bd414153bab86f4362ac23d537b78b0"
-  integrity sha512-gWHkaGzGYjmDoYxksFZynWTzvXOAjQ5dd7xuTMYlv4zpWlLSb6v0QLSZjELzP5dMs1ox30O1BIPs9dgqlMHuLQ==
+terser-webpack-plugin@^2.3.4:
+  version "2.3.4"
+  resolved "https://registry.yarnpkg.com/terser-webpack-plugin/-/terser-webpack-plugin-2.3.4.tgz#ac045703bd8da0936ce910d8fb6350d0e1dee5fe"
+  integrity sha512-Nv96Nws2R2nrFOpbzF6IxRDpIkkIfmhvOws+IqMvYdFLO7o6wAILWFKONFgaYy8+T4LVz77DQW0f7wOeDEAjrg==
   dependencies:
     cacache "^13.0.1"
     find-cache-dir "^3.2.0"