Bump handlebars from 4.7.6 to 4.7.7

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.7.6 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@v4.7.6...v4.7.7)

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

Author: dependabot[bot]

package-lock.json

@@ -145,7 +145,7 @@
     "file-loader": "^6.1.0",
     "glob": "^7.1.6",
     "got": "^10.6.0",
-    "handlebars": "^4.7.3",
+    "handlebars": "^4.7.7",
     "hasha": "5.0.0",
     "html-webpack-plugin": "^4.2.0",
     "immutable": "^4.0.0-rc.12",