Update loader-utils requirement from 1.1.0 to 1.2.3 (#3793)

Updates the requirements on [loader-utils](https://github.com/webpack/loader-utils) to permit the latest version.
- [Release notes](https://github.com/webpack/loader-utils/releases)
- [Changelog](https://github.com/webpack/loader-utils/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/loader-utils/commits/v1.2.3)

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

package.json

@@ -155,7 +155,7 @@
 		"koa-slow": "2.1.0",
 		"koa-views": "6.1.4",
 		"langmap": "0.0.16",
-		"loader-utils": "1.1.0",
+		"loader-utils": "1.2.3",
 		"minio": "7.0.2",
 		"mkdirp": "0.5.1",
 		"mocha": "5.2.0",