Update underscore lib to 1.13.*

Hi guys, I'm closing this as a duplicate of #3443

Also need that fix after pen test!

Thanks for reporting this, @zgeist.

Security and dependency issues are important. The GrapesJS team actively works on keeping dependencies up-to-date.

For you right now:

1. Run npm audit fix to see available patches
2. Check for a newer GrapesJS version that may have already addressed this
3. If available, test the latest stable release before upgrading
4. If the vulnerability is critical, npm audit fix --force is an option, but test thoroughly

Understanding the risk:

• Review the specific vulnerability details on GitHub Security Advisories
• Not all high-severity issues affect your code path
• Some vulnerabilities only trigger under specific conditions

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