chore(deps): update codecov/codecov-action action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
codecov/codecov-action	action	major	v3 -> v4

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Release Notes

codecov/codecov-action (codecov/codecov-action)

v4

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[ctreatma]

We rely on tokenless uploads to upload code coverage reports. Since codecov/codecov-action@v4 removes support for tokenless uploads, we cannot upgrade. If a future release restores support for tokenless uploads or if the Codecov platform is updated to remove support for tokenless uploads, we can revisit our upload process.

[renovate]

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