Bump handlebars from 4.7.7 to 4.7.8

Bumps [handlebars](https://github.com/handlebars-lang/handlebars.js) from 4.7.7 to 4.7.8.
- [Release notes](https://github.com/handlebars-lang/handlebars.js/releases)
- [Changelog](https://github.com/handlebars-lang/handlebars.js/blob/v4.7.8/release-notes.md)
- [Commits](handlebars-lang/handlebars.js@v4.7.7...v4.7.8)

---
updated-dependencies:
- dependency-name: handlebars
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -19,7 +19,7 @@
     "@octokit/rest": "^19.0.13",
     "escape-goat": "^3.0.0",
     "github-username-regex": "^1.0.0",
-    "handlebars": "^4.7.7",
+    "handlebars": "^4.7.8",
     "http-errors": "^2.0.0",
     "http-graceful-shutdown": "^3.1.13",
     "koa": "^2.14.2",