Pin handlebars to 4.7.9

[befrvnk]

Summary

Fixes https://github.com/egym/android-emulator-runner/security/dependabot/25

• refresh package-lock.json so the transitive ts-jest dependency resolves handlebars@4.7.9
• avoid adding an overrides entry because ts-jest already allows the patched version via its existing semver range
• keep the fix limited to the lockfile resolution while preserving the current dependency graph

Testing

• npm test