Potential fix for code scanning alert no. 95: Workflow does not contain permissions

[JSTONE1111]

Potential fix for https://github.com/JSTONE1111/chainlink/security/code-scanning/95

In general, this problem is fixed by adding an explicit permissions block either at the top level of the workflow (to apply to all jobs) or within the specific job needing permissions. The block should request only the minimal scopes required for the workflow to function. For workflows that only need to read code, contents: read is often sufficient; for workflows that push commits or create tags, contents: write is required.

For this particular workflow, the sync job performs git push origin upstream/develop:develop, which requires write access to repository contents. It does not interact with issues, pull requests, or other resources. Therefore, the least-privilege configuration is to add permissions: contents: write to the sync job. We will edit .github/workflows/sync-develop-from-smartcontractkit-chainlink.yml and insert a permissions block under jobs: sync: alongside name: and runs-on:. No imports or additional methods are needed; this is a pure YAML configuration change that does not alter the runtime logic of the steps.

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