CompatHelper: add new compat entry for JSON at version 0.21, (keep existing compat)#2

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compathelper/new_version/2023-10-02-01-07-09-721-00631776117Baffelan/IOM_MakeWebJSON:compathelper/new_version/2023-10-02-01-07-09-721-00631776117Copy head branch name to clipboard