[Snyk] Security upgrade handlebars from 4.3.0 to 4.7.7

merge advice

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

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 135 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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jupe / puml2code