For PHP 8.1 FileHelper::getMimeType always return null for UploadedFile

[zerg4000]

For PHP 8.1 FileHelper::getMimeType always return null for UploadedFile and validate return false.
Because UploadedFile dont have extension, see FileHelper::getMimeType method

if (PHP_VERSION_ID >= 80100) {
    return static::getMimeTypeByExtension($file, $magicFile);
}

and see
FileValidator::validateExtension method:

$mimeType = FileHelper::getMimeType($file->tempName, null, false);
if ($mimeType === null) {
    return false;
}

What steps will reproduce the problem?

Use rule for UploadedFile

public function rules() {
      return [
            ['image', 'image', 'extensions' => 'png, jpg, webp']
    ];

and upload png, jpg or webp file

What is the expected result?

validate true

What do you get instead?

validate false
Error: Only files with these extensions are allowed: png, jpg, webp.

Additional info

Q	A
Yii version	2.0.45
PHP version	8.1.7
Operating system	Alpine

[lesha724]

#19307, #19243 fix it. Check it in current master branch