* Added support for string as Cookie::$expire
* Updated changelog for #19920 (Broadened the accepted type of `Cookie::$expire` from `int` to `int|string|null`)
* Fixed `\yiiunit\framework\web\ResponseTest::parseHeaderCookies()` to overwrite existing cookie.
* Added support for `\DateTimeInterface` in `\yii\web\Cookie::$expire`
* Fixed `\yiiunit\framework\web\ResponseTest::cookiesTestProvider()` for PHP 5.4 and commited missing code for \DateTimeInterface processing in `\yii\web\Response::sendCookies()`
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