Bump handlebars from 4.5.3 to 4.7.7

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.5.3 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@v4.5.3...v4.7.7)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -47,7 +47,7 @@
     "webpack-dev-server": "^3.11.2"
   },
   "dependencies": {
-    "handlebars": "^4.5.3",
+    "handlebars": "^4.7.7",
     "tiyl": "^1.1.4"
   }
 }