fix:revert codecov-action to v3

[svor]

What does this PR do?

fix:revert codecov-action to v3

Screenshot/screencast of this PR

What issues does this PR fix or reference?

How to test this PR?

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

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[openshift-ci]

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[github-actions]

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[openshift-ci]

@svor: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v12-images	a6d897c	link	true	/test v12-images
ci/prow/v12-plugins-test-pr-check	a6d897c	link	true	/test v12-plugins-test-pr-check

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