Iframe remove sandbox attribute

[gianlucainnocente]

Environment

Technology	Version
Flutter version	3.16.5
Plugin version	6.0.0
Android version	Only web
iOS version	Only web
macOS version	14.1.1
Xcode version	Only web
Google Chrome version	124.0.6367.61

Device information: Macbook pro

Description

**Expected behavior: Trying to load a html page containing the following code. I expect to see the pdf viewer:
<object class="pdf" data= "https://media.geeksforgeeks.org/wp-content/cdn-uploads/20210101201653/PDF.pdf" width="800" height="500"> </object>

**Current behavior: The following error occurred in js console:
Failed to load 'https://media.geeksforgeeks.org/wp-content/cdn-uploads/20210101201653/PDF.pdf' as a plugin, because the frame into which the plugin is loading is sandboxed.

Steps to reproduce

1. Simply open the following URL into an inapp webview using flutter web: https://igsolutions.it/pdf.html

I tried to pass the following setting but the sandbox attribute is still there:
initialSettings: InAppWebViewSettings( iframeSandbox: Set<Sandbox>.from(Sandbox.ALLOW_ALL), ),

[github-actions]

👋 @gianlucainnocente

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