fix: update Codecov action to version 7.0.0 to fix verify signature failure

[shenxianpeng]

Fixes #80

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 07dbd828-f807-4d6c-9254-a787d83bfef7

📥 Commits

Reviewing files that changed from the base of the PR and between 4761672 and 2247e47.

📒 Files selected for processing (1)

• .github/workflows/py-coverage.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch shenxianpeng-patch-1

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