Bump handlebars from 4.7.3 to 4.7.7

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.7.3 to 4.7.7.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/master/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.7.3...v4.7.7)

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

Author: dependabot[bot]

package-lock.json

@@ -47,7 +47,7 @@
     "grunt-contrib-handlebars": "^2.0.0",
     "grunt-contrib-requirejs": "^1.0.0",
     "grunt-mocha-test": "^0.13.3",
-    "handlebars": "^4.4.0",
+    "handlebars": "^4.7.7",
     "handlebars-form-helpers": "^0.1.4",
     "hbs": "^4.0.5",
     "inquirer": "^7.3.0",