Bump handlebars from 4.7.2 to 4.7.3

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.7.2 to 4.7.3.
- [Release notes](https://github.com/wycats/handlebars.js/releases)
- [Changelog](https://github.com/wycats/handlebars.js/blob/master/release-notes.md)
- [Commits](https://github.com/wycats/handlebars.js/compare/v4.7.2...v4.7.3)

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

package.json

@@ -63,7 +63,7 @@
     "fs-extra": "^8.0.0",
     "glob": "^7.1.5",
     "globby": "^11.0.0",
-    "handlebars": "4.7.2",
+    "handlebars": "4.7.3",
     "html-to-image": "^0.1.0",
     "istanbul": "0.4.5",
     "istanbul-instrumenter-loader": "^3.0.1",