[Bug]: srcset is added multiple times to images in wysiwyg

[gfemorris]

Pimcore version

11.2.2

Steps to reproduce

Drop a big image into the wysiwyg so that a width is automatically applied. Without the width it does not occur.
We tested this with a localized field. I am not sure if it happens in a non-localized field as well.
srcset needs to be added to the allowed attributes of the img tag element in allow_elements in config.yaml

Actual Behavior

During the saving of the object Text::wysiwygText is called multiple times. Each time $additionalAttributes are added without replacing or checking if they are already existent. So you end up with an image tag with multiple srcsets.

Expected Behavior

srcset should be added only once into the image tag.