Update Codecov action to `v4` in CI workflows.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.97%. Comparing base (855522c) to head (8cb5048). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #20190 +/- ## ============================================= + Coverage 21.73% 64.97% +43.24% Complexity 11388 11388 ============================================= Files 430 430 Lines 37113 36908 -205 ============================================= + Hits 8065 23981 +15916 + Misses 29048 12927 -16121 ```

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