Bump handlebars from 4.7.7 to 4.7.9 (#300)

Bumps [handlebars](https://github.com/handlebars-lang/handlebars.js) from 4.7.7 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@v4.7.7...v4.7.9)

---
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

@@ -51,7 +51,7 @@
   },
   "dependencies": {
     "@types/fs-extra": "^9.0.13",
-    "handlebars": "^4.7.7",
+    "handlebars": "^4.7.9",
     "remark-frontmatter": "^4.0.1",
     "yaml": "^2.3.1"
   },