GPT4All: Add version v3.9.0

[guillermodotn]

Adding manifest for installation of GPT4All.

Closes #11531

• I have read the Contributing Guide.

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gpt4all

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[guillermodotn]

/verify manifest checkver

[github-actions]

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gpt4all

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[aliesbelik]

• Guess bin/shortcuts fields could be added as well.
• Please update to the latest version.

[guillermodotn]

The installer automatically creates the shortcut, so including the shortcut property would create two of them, which I find unnecessary. I have added the following section to the manifest explaining why the shortcut property isn't included:

"##": [
        [
            "Shortcut section omitted as it is automatically created by the installer.",
            "bin/bin/chat.exe",
            "GPT4All"
        ]
    ],

[guillermodotn]

The comment explaining why the shortcut section was omitted has been modified as follows to resolve the workflow syntax checker issue (comments can not contain arrays).

"##": "Shortcut section omitted as it is automatically created by the installer.",