Fileupload in repeating group contrast is too low

[Magnusrm]

Description of the bug

Since the fileupload is an interactive element the contrast should be at least 3:1 according to accessability guidelines. Here the contrast between the fileupload border and the background is 2.38:1 which is too low.
We should make use of the designsystems design tokens in order to ensure sufficient contrast and enable use of themes and dark mode in the future.

Steps To Reproduce

1. go to an app with a file upload in a repeating group ex. TTDs "frontend-test"
2. open the repeating group and see that the contrast is too low using color contrast tools like "Colour contrast checker"

Additional Information

No response