Upgrade sweetalert2 dependency to latest

[limonte]

Good day, author of @sweetalert2 here

Brief description of what is fixed or changed

Upgrading the sweetalert2 dependency to the latest version.

Here are release notes for the major release https://github.com/sweetalert2/sweetalert2/releases/tag/v11.0.0
None of the breaking changes seem to be relevant to canvasboard's codebase.

Checklist

Put an x in the boxes that apply

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• My changes does not break the current system and it passes all the current test cases.

[goliakshay357]

Hello @limonte,
Thanks for the update :)