Bump terser-webpack-plugin from 3.0.3 to 3.0.6 (#14238)

Bumps [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin) from 3.0.3 to 3.0.6.
- [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](https://github.com/webpack-contrib/terser-webpack-plugin/compare/v3.0.3...v3.0.6)

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

package.json

@@ -156,7 +156,7 @@
     "stacktrace-js": "^2.0.2",
     "stringz": "^2.1.0",
     "substring-trie": "^1.0.2",
-    "terser-webpack-plugin": "^3.0.3",
+    "terser-webpack-plugin": "^3.0.6",
     "tesseract.js": "^2.1.1",
     "throng": "^4.0.0",
     "tiny-queue": "^0.2.1",