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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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: d5c1c4ce-d8e3-4b8f-b466-3926556fcd46

📥 Commits

Reviewing files that changed from the base of the PR and between 9a76542 and fc0bf88.

📒 Files selected for processing (2)

• .github/workflows/test-bohrium.yml
• .github/workflows/test.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.33%. Comparing base (9a76542) to head (fc0bf88).
⚠️ Report is 21 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #564      +/-   ##
==========================================
+ Coverage   47.64%   48.33%   +0.68%     
==========================================
  Files          39       40       +1     
  Lines        3912     3958      +46     
==========================================
+ Hits         1864     1913      +49     
+ Misses       2048     2045       -3     

☔ View full report in Codecov by Sentry.
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