fix(security): bumping jspdf dep to 4.2.1

[kdinev]

Closes #

Additional information (check all that apply):

• Bug fix
• New functionality
• Documentation
• Demos
• CI/CD

Checklist:

• All relevant tags have been applied to this PR
• This PR includes unit tests covering all the new code (test guidelines)
• This PR includes API docs for newly added methods/properties (api docs guidelines)
• This PR includes feature/README.MD updates for the feature docs
• This PR includes general feature table updates in the root README.MD
• This PR includes CHANGELOG.MD updates for newly added functionality
• This PR contains breaking changes
• This PR includes ng update migrations for the breaking changes (migrations guidelines)
• This PR includes behavioral changes and the feature specification has been updated with them

[Copilot]

Pull request overview

Updates the jspdf dependency to a patched version to address a security concern, keeping both the workspace and published library package aligned.

Changes:

• Bump jspdf from ^4.0.0 to ^4.2.1 in the root workspace package.json.
• Bump jspdf from ^4.0.0 to ^4.2.1 in projects/igniteui-angular/package.json.
• Document the security-related dependency bump in CHANGELOG.md under a new 21.1.3 entry.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
package.json	Updates workspace dependency version for jspdf to ^4.2.1.
projects/igniteui-angular/package.json	Updates the library package dependency version for jspdf to ^4.2.1.
CHANGELOG.md	Adds a 21.1.3 “Security Fixes” note for the jspdf bump.

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