Fix php 8.x deprecations [#3589187]

( ! ) Deprecated: Drupal\inline_all_css\Asset\CriticalCssCollectionRenderer::__construct(): Implicitly marking parameter $request_stack as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/web/modules/contrib/inline_all_css/src/Asset/CriticalCssCollectionRenderer.php on line 101

Issue fork inline_all_css-3589187

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3589187-fix-php-8.x changes, plain diff MR !12
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