`manifest.json` shows untrusted schema error for AdaptiveCard reference

[Artemis-Coder17]

Description

When opening manifest.json in a newly generated Fiori project, an error is reported on line 1 if
the UI5 Language Assistant extension is installed and enabled.

Error:

Problems loading reference '/definitions/AdaptiveCard': Unable to load schema from
'https://adaptivecards.io/schemas/adaptive-card.json': Location
https://adaptivecards.io/schemas/adaptive-card.json is untrusted.

Steps to Reproduce

1. Generate a new Fiori application
2. Ensure UI5 Language Assistant is installed and enabled
3. Open manifest.json

Expected Result
No errors in a freshly generated project.

Actual Result
An untrusted schema error is reported on line 1 of manifest.json.

Screenshot

Environment

• VS Code
• UI5 Language Assistant Support: 4.0.91
• Mac OS