PHP Deprecated notice for Imagify_Files_Iterator::accept()

[vmanthos]

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• Made sure you’re on the latest version 👍 2.1.1
• Used the search feature to ensure that the bug hasn’t been reported before 👍

Describe the bug

The following appears in the debug.log (PHP 8.1):

PHP Deprecated:  Return type of Imagify_Files_Iterator::accept() should either be compatible with FilterIterator::accept(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /shared/httpd/wprocketest/htdocs/wp-content/plugins/imagify-plugin/inc/classes/class-imagify-files-iterator.php on line 65

To Reproduce

Steps to reproduce the behavior:

1. Go to Imagify's settings page (/wp-admin/options-general.php?page=imagify)
2. Add a custom folder:
   
3. Check the debug.log

Expected behavior

No deprecation notices should be there in the debug.log.

Screenshots

N/A

Additional context

N/A

Backlog Grooming (for WP Media dev team use only)

• Reproduce the problem
• Identify the root cause
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[Mai-Saad]

Using PHP 8.2, can see the following error with the steps below:
[12-Jul-2023 08:37:58 UTC] PHP Deprecated: Return type of Imagify_Files_Recursive_Iterator::accept() should either be compatible with FilterIterator::accept(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/new.rocketlabsqa.ovh/htdocs/wp-content/plugins/imagify/inc/classes/class-imagify-files-recursive-iterator.php on line 55
steps:
1- from the settings page, add the theme to the optimization process
2- from bulk optimization, select only custom folders and click imagify all
Notes:

• happening on Imagify 2.1.1 and 2.1.2
• to reproduce the error in main issue, the custom folder shall have subfolder or just click add folder then cancel

[Mai-Saad]

Can see the following error with the following steps:
1- Select folders for optimization at the settings page
2- Visit https://new.rocketlabsqa.ovh/wp-admin/upload.php?page=imagify-files
3- Click scan your selected folders and check logs
[13-Sep-2023 09:29:51 UTC] PHP Deprecated: Return type of Imagify_Files_Recursive_Iterator::accept() should either be compatible with FilterIterator::accept(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /var/www/new.rocketlabsqa.ovh/htdocs/wp-content/plugins/imagify-plugin/inc/classes/class-imagify-files-recursive-iterator.php on line 55
Note: using PHP 8.2.10 and imagify on 2.1.1