ci: use OIDC for codecov-action

[njzjz-bot]

Replace token-based authentication with OIDC (OpenID Connect) for codecov-action.
This is more secure and eliminates the need to manage upload tokens.

Changes:

• Add use_oidc: true to codecov-action configuration
• Add id-token: write permission at workflow level
• Remove token parameter from codecov-action (ignored when using OIDC)

This improves security and follows codecov-action best practices.

Generated by the task: njzjz-bot/njzjz-bot#25.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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