Build: Bump handlebars from 4.7.8 to 4.7.9

Bumps [handlebars](https://github.com/handlebars-lang/handlebars.js) from 4.7.8 to 4.7.9.
- [Release notes](https://github.com/handlebars-lang/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/v4.7.9/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.7.8...v4.7.9)

Closes gh-114

---
updated-dependencies:
- dependency-name: handlebars
  dependency-version: 4.7.9
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -5,7 +5,7 @@
     "grunt": "1.6.1",
     "grunt-jquery-content": "3.3.1",
     "grunt-sri": "0.2.0",
-    "handlebars": "4.7.8",
+    "handlebars": "4.7.9",
     "lodash": "4.17.23",
     "semver": "7.5.4"
   }