Fix cache

[jeddy3]

A test was skipped in #5306 and needs looking into.

stylelint/lib/__tests__/standalone-cache.test.js

Lines 165 to 183 in e0004aa

	// eslint-disable-next-line jest/no-disabled-tests
	it.skip("cache doesn't do anything if string is passed", async () => {
	const config = {
	code: '.foo {}',
	codeFilename: 'foo.css',
	cache: true,
	config: {
	rules: {
	'color-no-invalid-hex': true,
	},
	},
	};
	const lintResults = await standalone(config);
	expect(lintResults.errored).toBe(false);
	await expect(fileExists(expectedCacheFilePath)).resolves.toBe(false);
	});