messages.0.content.0.image.source.base64.data: URL sources are not supported

[GautierT]

Description

Since this commit aeba38e a call to Anthropic from @ai-sdk/google-vertex will give this error : messages.0.content.0.image.source.base64.data: URL sources are not supported with message like :

{
            role: 'user',
            content: [
              {
                type: 'file',
                data: 'https://github.com/vercel/ai/blob/main/examples/ai-core/data/ai.pdf?raw=true',
                mimeType:'application/pdf',
              },
            ],
          }

AI SDK Version

@ai-sdk/google-vertex": "^2.2.23"
"ai": "^4.3.10"