Bump serialize-javascript, copy-webpack-plugin and terser-webpack-plugin

Bumps [serialize-javascript](https://github.com/yahoo/serialize-javascript) to 4.0.0 and updates ancestor dependencies [serialize-javascript](https://github.com/yahoo/serialize-javascript), [copy-webpack-plugin](https://github.com/webpack-contrib/copy-webpack-plugin) and [terser-webpack-plugin](https://github.com/webpack-contrib/terser-webpack-plugin). These dependencies need to be updated together.


Updates `serialize-javascript` from 2.1.2 to 4.0.0
- [Release notes](https://github.com/yahoo/serialize-javascript/releases)
- [Commits](yahoo/serialize-javascript@v2.1.2...v4.0.0)

Updates `copy-webpack-plugin` from 5.1.1 to 5.1.2
- [Release notes](https://github.com/webpack-contrib/copy-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/copy-webpack-plugin/blob/v5.1.2/CHANGELOG.md)
- [Commits](webpack-contrib/copy-webpack-plugin@v5.1.1...v5.1.2)

Updates `terser-webpack-plugin` from 1.4.3 to 1.4.5
- [Release notes](https://github.com/webpack-contrib/terser-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/terser-webpack-plugin/blob/v1.4.5/CHANGELOG.md)
- [Commits](webpack-contrib/terser-webpack-plugin@v1.4.3...v1.4.5)

---
updated-dependencies:
- dependency-name: serialize-javascript
  dependency-type: indirect
- dependency-name: copy-webpack-plugin
  dependency-type: direct:production
- dependency-name: terser-webpack-plugin
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "@openemp/styleguide": "^0.0.2",
     "@reach/router": "1.3.3",
-    "copy-webpack-plugin": "5.1.1",
+    "copy-webpack-plugin": "5.1.2",
     "material-ui": "^0.20.2",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",