Rename-media-files-is-not-possible.md

### Shopware Version

6.7.8.0

### Affected area / extension

Platform(Default)

### Actual behaviour

As soon as a file(jpg) is in use, it is not possible to rename the file. It shows an error message.

### Expected behaviour

the file should be renamed

### How to reproduce

1. Upload a media file(jpg)
2. deposit this file in a product
3. now try to rename the media file
4. an error occurs
