PHP8.1 unable to import Media type

When using PHP8.1 it is not possible to import Media type "Email", "SMS" and "Script"

Steps to reproduce:

1. Administration -> Media types
2. Create new media type with type "Email"
3. Select created media type
4. Export media type
5. Delete created media type
6. Import created file

Result:

Import failed:

Error message received:

• Invalid parameter "/1/timeout": value must be 30s.

Expected:

Message shown: "Imported successfully"

Note:

After preliminary investigation issue appears to be in CMediaType.php file with getvalidationrulesbytype timeout