Update rimraf requirement from 2.5.4 to 3.0.0 in /webpack/code-splitting

Updates the requirements on [rimraf](https://github.com/isaacs/rimraf) to permit the latest version.
- [Release notes](https://github.com/isaacs/rimraf/releases)
- [Changelog](https://github.com/isaacs/rimraf/blob/master/CHANGELOG.md)
- [Commits](isaacs/rimraf@v2.5.4...v3.0.0)

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

Author: dependabot-preview[bot]

webpack/code-splitting/package.json

@@ -48,7 +48,7 @@
     "karma-webpack": "2.0.2",
     "null-loader": "0.1.1",
     "raw-loader": "0.5.1",
-    "rimraf": "2.5.4",
+    "rimraf": "3.0.0",
     "source-map-loader": "0.1.6",
     "sourcemap-istanbul-instrumenter-loader": "0.2.0",
     "style-loader": "0.13.2",