Support Swal.update static method, new in sweetalert2 v8

[zenflow]

As of PR #72, this package now supports sweetalert2 v8, but does not support the new Swal.update static method introduced in v8.

Here is a good place to start, a branch I created when reviewing the PR for the new method: https://github.com/sweetalert2/sweetalert2-react-content/compare/feature/integrate-update-method

Since this will mean big changes to the codebase (almost rewriting the package) I think we should release this change in the next major, even though the change should be backwards-compatible.

[limonte]

🎉 This issue has been resolved in version 4.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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