Update dependency handlebars to v4.7.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
handlebars (source)	dependencies	patch	4.7.2 -> 4.7.3

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Release Notes

wycats/handlebars.js

### [`v4.7.3`](https://togithub.com/wycats/handlebars.js/blob/master/release-notes.md#v473---February-5th-2020) [Compare Source](https://togithub.com/wycats/handlebars.js/compare/v4.7.2...v4.7.3) Chore/Housekeeping: - [#​1644](https://togithub.com/wycats/handlebars.js/issues/1644) - Download links to aws broken on handlebarsjs.com - access denied ([@​Tea56](https://api.github.com/users/Tea56)) - Fix spelling and punctuation in changelog - [`d78cc73`](https://togithub.com/wycats/handlebars.js/commit/d78cc73) Bugfixes: - Add Type Definition for Handlebars.VERSION, Fixes [#​1647](https://togithub.com/wycats/handlebars.js/issues/1647) - [`4de51fe`](https://togithub.com/wycats/handlebars.js/commit/4de51fe) - Include Type Definition for runtime.js in Package - [`a32d05f`](https://togithub.com/wycats/handlebars.js/commit/a32d05f) Compatibility notes: - No incompatibilities are to be expected [Commits](https://togithub.com/wycats/handlebars.js/compare/v4.7.2...v4.7.3)

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