Allow fork-ts-checker-webpack-plugin ^8.0 and ^9.0

[buffcode]

Widen allowed scope of fork-ts-checker-webpack-plugin to v8 and v9.

• Changelog 9.0
• Changelog 8.0

[buffcode]

Failing test seems to be unrelated to this MR:

  1) The config-generator function
       enableEslintPlugin() adds the eslint-webpack-plugin
         enableEslintPlugin():
     Error: Timeout of 2000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (D:\a\webpack-encore\webpack-encore\test\config-generator.js)
      at processImmediate (node:internal/timers:466:21)

[weaverryan]

Thanks @buffcode!