Bump handlebars from 4.5.2 to 4.5.3

Bump handlebars from 4.5.2 to 4.5.3

Bumps [handlebars](https://github.com/wycats/handlebars.js) from 4.5.2 to 4.5.3.
- [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/v4.5.2...v4.5.3)

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Signed-off-by: npmbuildbot[bot] <npmbuildbot[bot]@users.noreply.github.com>
Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>
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