Update vue-loader requirement from 15.4.2 to 15.5.1 (#3952)

Updates the requirements on [vue-loader](https://github.com/vuejs/vue-loader) to permit the latest version.
- [Release notes](https://github.com/vuejs/vue-loader/releases)
- [Changelog](https://github.com/vuejs/vue-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vue-loader/commits/v15.5.1)

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

package.json

@@ -228,7 +228,7 @@
 		"vue-cropperjs": "3.0.0",
 		"vue-i18n": "8.7.0",
 		"vue-js-modal": "1.3.28",
-		"vue-loader": "15.4.2",
+		"vue-loader": "15.5.1",
 		"vue-marquee-text-component": "1.1.1",
 		"vue-router": "3.0.2",
 		"vue-sequential-entrance": "1.1.3",