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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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.17%. Comparing base (29de306) to head (5af975e).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #327   +/-   ##
=======================================
  Coverage   84.17%   84.17%           
=======================================
  Files         104      104           
  Lines        6111     6111           
=======================================
  Hits         5144     5144           
  Misses        967      967           

☔ View full report in Codecov by Sentry.
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