Refactor: Replace deprecated Linter.FlatConfig with Linter.Config (#2817)

Author: kspace-trk

index.d.ts

@@ -2,15 +2,15 @@ import type {ESLint, Linter} from 'eslint';
 
 declare const eslintPluginUnicorn: ESLint.Plugin & {
 	configs: {
-		recommended: Linter.FlatConfig;
-		unopinionated: Linter.FlatConfig;
-		all: Linter.FlatConfig;
+		recommended: Linter.Config;
+		unopinionated: Linter.Config;
+		all: Linter.Config;
 
 		/** @deprecated Use `all` instead. The `flat/` prefix is no longer needed. */
-		'flat/all': Linter.FlatConfig;
+		'flat/all': Linter.Config;
 
 		/** @deprecated Use `recommended` instead. The `flat/` prefix is no longer needed. */
-		'flat/recommended': Linter.FlatConfig;
+		'flat/recommended': Linter.Config;
 	};
 };