[Armbian build PR] - actions: forked-helper: Don't escape multiline strings

[RSS Bot]

Description

Before, the string would look like this and fails since it's not a valid JSON: {%0A "after": "f6ddb25e6d6affbfdd92b4cd33a9b874254b4a09",%0A "base_ref": null,%0A "before": "0000000000000000000000000000000000000000",%0A "commits": [%0A {%0A "author": ...

After, the JSON gets correctly parsed:

{
    "after": "090850f02e35af562dd5adc39c23d423be6bfe15",
    "base_ref": null,
    "before": "0000000000000000000000000000000000000000",
    "commits": [
      {
        "author": {
...

Escaping multiline strings is not needed anymore with GITHUB_OUTPUT. See https://github.com/orgs/community/discussions/26288#discussioncomment-3876281

Instead, use the toJSON function that Actions offers to convert the event object to JSON.

How Has This Been Tested?

• [x] Run the fixed workflow once

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] My changes generate no new warnings

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