DEP Update JS dependencies

[GuySartorelli]

Description

Update JS dependencies and rebuild tinymce skin (since the tinymce dep was updated). Supercedes https://github.com/silverstripe/silverstripe-admin/pull/1644 which was failing CI

Issues

• https://github.com/silverstripe/.github/issues/178

Pull request checklist

• [x] The target branch is correct
  • See picking the right version
• [x] All commits are relevant to the purpose of the PR (e.g. no debug statements, unrelated refactoring, or arbitrary linting)
  • Small amounts of additional linting are usually okay, but if it makes it hard to concentrate on the relevant changes, ask for the unrelated changes to be reverted, and submitted as a separate PR.
• [x] The commit messages follow our commit message guidelines
• [x] The PR follows our contribution guidelines
• [x] Code changes follow our coding conventions
• [x] tests aren't necessary for this change
• [x] No docs need to be updated
• [x] CI is green

[GuySartorelli]

Jest tests fail when I try to build so need to look into that a bit - that's probably what was causing the CI to fail in the automated PR.

[GuySartorelli]

Seems to be caused by https://github.com/JedWatson/react-select/releases/tag/react-select%405.8.0 - but there's more to it than just that. It seems like I should be able to just swap aria-context for aria-focused in the test.... except there seems to never be any text inside the aria-focused element. This seems to be the case when running it in the browser as well, so it's not just a jest wonkiness issue.

[GuySartorelli]

I've opted to remove the tests that were testing the focus message - that's not functionality we control, it's part of the react-select library, so it doesn't make sense for us to be testing that anyway.