Bump handlebars from 4.0.12 to 4.7.3

[dependabot[bot]]

Bumps handlebars from 4.0.12 to 4.7.3.

Changelog

Sourced from handlebars's changelog.

v4.7.3 - February 5th, 2020

Chore/Housekeeping:

• #1644 - Download links to aws broken on handlebarsjs.com - access denied (@Tea56)
• Fix spelling and punctuation in changelog - d78cc73

Bugfixes:

• Add Type Definition for Handlebars.VERSION, Fixes #1647 - 4de51fe
• Include Type Definition for runtime.js in Package - a32d05f

Compatibility notes:

• No incompatibilities are to be expected

Commits

v4.7.2 - January 13th, 2020

Bugfixes:

• fix: don't wrap helpers that are not functions - 9d5aa36, #1639

Chore/Build:

• chore: execute saucelabs-task only if access-key exists - a4fd391

Compatibility notes:

• No breaking changes are to be expected

Commits

v4.7.1 - January 12th, 2020

Bugfixes:

• fix: fix log output in case of illegal property access - f152dfc
• fix: log error for illegal property access only once per property - 3c1e252

Compatibility notes:

• no incompatibilities are to be expected.

Commits

v4.7.0 - January 10th, 2020

Features:

... (truncated)

Commits

• c978969 v4.7.3
• 9278f21 Update release notes
• d78cc73 Fixes spelling and punctuation
• 4de51fe Add Type Definition for Handlebars.VERSION, Fixes #1647
• a32d05f Include Type Definition for runtime.js in Package
• ad63f51 chore: add missing "await" in aws-s3 publishing code
• 586e672 v4.7.2
• f0c6c4c Update release notes
• a4fd391 chore: execute saucelabs-task only if access-key exists
• 9d5aa36 fix: don't wrap helpers that are not functions
• Additional commits viewable in compare view

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