Bump handlebars from 4.7.3 to 4.7.6

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.7.3 to 4.7.6.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/wycats/handlebars.js/blob/master/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.7.3...v4.7.6)

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

Author: dependabot-preview[bot]

js/notifications.js

@@ -39,7 +39,7 @@
 		"eslint-plugin-standard": "^4.0.1",
 		"eslint-plugin-vue": "^6.2.2",
 		"file-loader": "^6.0.0",
-		"handlebars": "^4.7.3",
+		"handlebars": "^4.7.6",
 		"handlebars-loader": "^1.7.1",
 		"node-sass": "^4.13.1",
 		"sass-loader": "^8.0.2",