Upgrade Handelbars to > 4.7.6 - code execution vulnerability

[elgreg]

Per https://www.cve.org/CVERecord?id=CVE-2021-23369

The package handlebars before 4.7.7 are vulnerable to Remote Code Execution (RCE) when selecting certain compiling options to compile templates coming from an untrusted source.

Can package.json upgrade to 4.7.8?