[Snyk] Security upgrade handlebars from 4.5.3 to 4.7.7

[qsays]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	673/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 5.6	Remote Code Execution (RCE) SNYK-JS-HANDLEBARS-1056767	No	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: handlebars

The new version differs by 71 commits.

• a9a8e40 v4.7.7
• e66aed5 Update release notes
• 7d4d170 disable IE in Saucelabs tests
• eb860c0 fix weird error in integration tests
• b6d3de7 fix: check prototype property access in strict-mode (#1736)
• f058970 fix: escape property names in compat mode (#1736)
• 77825f8 refator: In spec tests, use expectTemplate over equals and shouldThrow (#1683)
• 3789a30 chore: start testing on Node.js 12 and 13
• e6ad93e v4.7.6
• 2bf4fc6 Update release notes
• b64202b Update release-notes.md
• c2f1e62 Switch cmd parser to latest minimist
• 08e9a11 Revert "chore: set Node.js compatibility to v6+"
• 1fd2ede v4.7.5
• 3c9c2f5 Update release notes
• 16487a0 chore: downgrade yargs to v14
• 309d2b4 chore: set Node.js compatibility to v6+
• 645ac73 test: fix integration tests
• b454b02 docs: update release-docs in CONTRIBUTING.md
• 7adc19a v4.7.4
• 9dd8d10 Update release notes
• 4671c4b Use tmp directory for files written during tests
• e46baa1 tasks/test-bin.js: Delete duplicate test
• c491b4e Revert "Update release-notes.md"

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