Update iubenda-cookie-class

Problem/Motivation

Add new features, see release notes:

• https://github.com/iubenda/iubenda-cookie-class/releases/tag/v4.1.9
• https://github.com/iubenda/iubenda-cookie-class/releases/tag/v4.1.10
• https://github.com/iubenda/iubenda-cookie-class/releases/tag/v4.1.11

Proposed resolution

Update composer.json with new library version.
https://github.com/iubenda/iubenda-cookie-class/releases/tag/4.1.11

Remaining tasks

TBD