Update webpack requirement from 4.28.4 to 4.29.0 (#4077)

Updates the requirements on [webpack](https://github.com/webpack/webpack) to permit the latest version.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](https://github.com/webpack/webpack/commits/v4.29.0)

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

package.json

@@ -245,7 +245,7 @@
 		"vuex-persistedstate": "2.5.4",
 		"web-push": "3.3.3",
 		"webfinger.js": "2.7.0",
-		"webpack": "4.28.4",
+		"webpack": "4.29.0",
 		"webpack-cli": "3.2.1",
 		"websocket": "1.0.28",
 		"ws": "6.1.3",