Bump handlebars to 4.7.9 for security fix

[sofiachakir]

Change description

Bump handlebars to 4.7.9 for security fix

Type of change

• Bug fix (fixes an issue)
• New feature (adds functionality)
• Security fix

Related issues

Fix Handlebars dependabot alerts

Checklists

Development

• Lint rules pass locally
• Application changes have been tested thoroughly
• Automated tests covering modified code pass

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

Network

• Changes to network configurations have been reviewed
• Any newly exposed public endpoints or data have gone through security review

Code review

• Pull request has a descriptive title and context useful to a reviewer. Screenshots or screencasts are attached as
  necessary
• reviewers assigned
• Pull request linked to task tracker where applicable