fix: remove outdated types in ParserOptions.ecmaFeatures (#19944)

fix: remove outdated types `ParserOptions.ecmaFeatures.experimentalObjectRestSpread`

Author: ntnyq

lib/types/index.d.ts

@@ -1597,7 +1597,6 @@ export namespace Linter {
 					globalReturn?: boolean | undefined;
 					impliedStrict?: boolean | undefined;
 					jsx?: boolean | undefined;
-					experimentalObjectRestSpread?: boolean | undefined;
 					[key: string]: any;
 			  }
 			| undefined;

tests/lib/types/types.test.ts

@@ -929,16 +929,6 @@ linter.verify(
 	{ parserOptions: { ecmaVersion: 6, ecmaFeatures: { globalReturn: true } } },
 	"test.js",
 );
-linter.verify(
-	SOURCE,
-	{
-		parserOptions: {
-			ecmaVersion: 6,
-			ecmaFeatures: { experimentalObjectRestSpread: true },
-		},
-	},
-	"test.js",
-);
 linter.verify(
 	SOURCE,
 	{
@@ -1358,16 +1348,6 @@ linterWithEslintrcConfig.verify(
 	{ parserOptions: { ecmaVersion: 6, ecmaFeatures: { globalReturn: true } } },
 	"test.js",
 );
-linterWithEslintrcConfig.verify(
-	SOURCE,
-	{
-		parserOptions: {
-			ecmaVersion: 6,
-			ecmaFeatures: { experimentalObjectRestSpread: true },
-		},
-	},
-	"test.js",
-);
 linterWithEslintrcConfig.verify(
 	SOURCE,
 	{