feat: change type from deprecated FlatConfig to Config

[irsooti]

Hello,

the type FlatConfig has been replaced with Config, according to the deprecation warning.

I just changed the type with the suggested one.

Cheers!

[changeset-bot]

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[MartinX3]

@irsooti I tried your change but maybe it's because I use the eslint.config.ts since ESLint 9.9.0.

eslint.config.ts:29:3 - error TS2345: Argument of type 'Config<RulesRecord>' is not assignable to parameter of type 'ConfigWithExtends'.
  Types of property 'languageOptions' are incompatible.
    Type 'import("path/node_modules/.pnpm/@types+eslint@9.6.0/node_modules/@types/eslint/index").Linter.LanguageOptions | undefined' is not assignable to type 'import("path/node_modules/.pnpm/@typescript-eslint+utils@8.0.1_eslint@9.9.0_jiti@1.21.6__typescript@5.5.4/node_modules/@typescript-eslint/utils/dist/ts-eslint/Config").FlatConfig.LanguageOptions | undefined'.
      Type 'import("path/node_modules/.pnpm/@types+eslint@9.6.0/node_modules/@types/eslint/index").Linter.LanguageOptions' is not assignable to type 'import("path/node_modules/.pnpm/@typescript-eslint+utils@8.0.1_eslint@9.9.0_jiti@1.21.6__typescript@5.5.4/node_modules/@typescript-eslint/utils/dist/ts-eslint/Config").FlatConfig.LanguageOptions'.
        Types of property 'globals' are incompatible.
          Type 'Globals | undefined' is not assignable to type 'GlobalsConfig | undefined'.
            Type 'Globals' is not assignable to type 'GlobalsConfig'.
              'string' index signatures are incompatible.
                Type 'GlobalConf' is not assignable to type 'GlobalVariableOption'.
                  Type '"readable"' is not assignable to type 'GlobalVariableOption'.

Edit:
It seems to work using Readonly<Linter.RulesRecord> instead of Linter.Config like used here
https://github.com/DefinitelyTyped/DefinitelyTyped/blob/136deed9a5c0adaea7bc7674783bb52608673d05/types/eslint__js/index.d.ts#L5