Potential fix for code scanning alert no. 1: Workflow does not contain permissions

[sumithemmadi]

Potential fix for https://github.com/sumithemmadi/json-to-plain-text/security/code-scanning/1

To fix the issue, explicitly set the permissions key to limit the permission scope granted to the GITHUB_TOKEN during the workflow execution. The most reliable way to do this is to add a permissions: block with contents: read either at the top of the workflow (preferably, so all jobs inherit it), or inside the test job definition if you want to limit scope to just this job. Given the provided snippet only contains a test job and no special needs, it is best practice to add the permissions: block right under the workflow name: at the top level, ensuring that all current and future jobs inherit this restriction by default. No additional imports, methods, or definitions are required.

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