chore: Make codecov badge green in README

[MaxymVlasov]

Description of your changes

We already know that there will be no 100% because of how it interprets MyPy checks, even if they're 100% actually.
Also, I found that there was an attempt to set up badge only for pytest, but the option was specified wrong, so I fixed that.
https://docs.codecov.com/docs/status-badges

Summary by CodeRabbit

• Documentation
  • Updated Codecov badge and reference URLs in README
  • Modified URL parameter from flags[] to flag for Codecov links

[coderabbitai]

Walkthrough

The pull request involves updating the Codecov badge URLs in the README.md file. The changes modify the URL query parameter from flags[] to flag, which appears to be a syntax adjustment for the Codecov badge and reference links. This update does not change the functionality of the README but ensures the correct URL format for displaying code coverage information.

Changes

File	Change Summary
README.md	Updated Codecov badge URLs from flags[] to flag parameter

Possibly related PRs

• chore: Add OSSF badge #787: The changes in this PR also involve modifications to the README.md file, specifically related to the addition of a new badge, which indicates a direct connection in terms of updates made to the same file.

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• README.md (1 hunks)

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• README.md

⏰ Context from checks skipped due to timeout of 90000ms (5)

• GitHub Check: 🧪 Tests / pytest@🐍3.9@macos-13
• GitHub Check: 🧪 Tests / pytest@🐍3.12@macos-14
• GitHub Check: 🧪 Tests / pytest@🐍3.11@macos-14
• GitHub Check: 🧪 Tests / pytest@🐍3.10@macos-14
• GitHub Check: 🧪 Tests / pytest@🐍3.10@macos-13

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[webknjaz]

interprets MyPy checks, even if they're 100% actually.

It's actually incorrect. If MyPy-flagged report was 100%, it would've been merged correctly. But MyPy just can't be at 100% rn.

[antonbabenko]

This PR is included in version 1.97.1 🎉