Linter.FlatConfig type is deprecated

[roottool]

Plugin version

v5.5.0

What problem do you want to solve?

The Linter.FlatConfig type provided by ESLint is currently deprecated.

eslint-plugin-jest-dom/index.d.ts

Lines 11 to 12 in 786e56e

	"flat/all": Linter.FlatConfig;
	"flat/recommended": Linter.FlatConfig;

Expected behavior

The type definition will be converted from Linter.FlatConfig to Linter.Config.

[at]deprecated Use Config instead of FlatConfig
https://github.com/eslint/eslint/blob/8bcd820f37f2361e4f7261a9876f52d21bd9de8f/lib/types/index.d.ts#L1319

Anything else?

This is the same content as testing-library/eslint-plugin-testing-library#985.

[G-Rath]

This type is being used on purpose for compatibility with both ESLint v8 and v9, as in the v8 types Linter.Config is an alias for the Linter.LegacyConfig whereas in v9 it's an alias for Linter.FlatConfig.

The type is deprecated only in v9, and it's usage will be replaced when support for ESLint v8 is dropped (which currently is not planned).