Update the Next and React Versions in all example projects

[TeresaGobble]

User Story:

The example projects located in the monorepo are not all up to date with stable versions of Next and React, resulting in issues with running the projects as is.

For example, the onboarding project located in "Getting Started with Faust" is central to a new user's understanding of Faust. Currently the project runs on deprecated versions of Next and React, and needs to be updated to the latest stable versions of each in order to run.

Acceptance Criteria:

Check each example project and assess whether an update to dependencies for Next and React are needed.

• app-router
• block-support
• custom-toolbar
• faustwp-getting-started

Note: getting-started is on old Faust and is now deprecated.

Notes:

React version should match app-router project: https://github.com/wpengine/faustjs/pull/1753/files