[BUG-UI/UX] Pdf do not render correctly in HF Spaces

[leiyre]

Describe the bug
Records with PDF works fine in Docker but do not render correctly inside an HF Spaces, has also been reported when the FE and BE are hosted separately in an ec2 instance

To Reproduce
Steps to reproduce the behavior:

1. Go to a dataset with records with PDF in HF Spaces
2. See empty record and error in console:
   Mixed Content: The page at 'https://...' was loaded over HTTPS, but requested an insecure frame 'http://...'. This request has been blocked; the content must be served over HTTPS.
   This happens even if we are pointing to a PDF with https

Expected behavior
Render it correctly

Environment (please complete the following information):

• OS [e.g. iOS]:
• Browser [e.g. chrome, safari]:
• Argilla Version [e.g. 1.0.0]:
• ElasticSearch Version [e.g. 7.10.2]:
• Docker Image (optional) [e.g. argilla:v1.0.0]: