build(deps): [security] bump handlebars from 4.5.1 to 4.7.6

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.5.1 to 4.7.6. **This update includes a security fix.**
- [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@v4.5.1...v4.7.6)

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