upgrade codecov/codecov-action from v3 to v4

[lalitb]

Changes

codecov action has been failing for some time for coverage upload as here , which made us to not fail the CI in case of this error:

[2024-05-09T01:03:01.791Z] ['info'] Processing /home/runner/work/opentelemetry-rust/opentelemetry-rust/lcov.info...
[2024-05-09T01:03:01.797Z] ['info'] Processing /home/runner/work/opentelemetry-rust/opentelemetry-rust/.github/codecov.yaml...
[2024-05-09T01:03:01.838Z] ['info'] Detected GitHub Actions as the CI provider.
[2024-05-09T01:03:02.270Z] ['info'] Pinging Codecov: https://codecov.io/upload/v4?package=github-action-3.1.6-uploader-0.7.3&token=*******&branch=remove-flaky-tests&build=9010678378&build_url=https%3A%2F%2Fgithub.com%2Fopen-telemetry%2Fopentelemetry-rust%2Factions%2Fruns%2F9010678378%2Fjob%2F24757118382&commit=ea21fee8da8d9ac418db48ce8124a5924b1f9473&job=CI&pr=1727&service=github-actions&slug=open-telemetry%2Fopentelemetry-rust&name=&tag=&flags=&parent=
[2024-05-09T01:03:02.487Z] ['error'] There was an error running the uploader: Error uploading to https://codecov.io: Error: There was an error fetching the storage URL during POST: 429 - {'detail': ErrorDetail(string='Rate limit reached. Please upload with the Codecov repository upload token to resolve issue. Expected time to availability: 14[37](https://github.com/open-telemetry/opentelemetry-rust/actions/runs/9010678378/job/24757118382?pr=1727#step:8:38)s.', code='throttled')}
[2024-05-09T01:03:02.488Z] ['info'] Codecov will exit with status code 0. If you are expecting a non-zero exit code, please pass in the `-Z` flag

upgrade to v4 seems to be fixing the issue and getting the code coverage report.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.3%. Comparing base (348ec9e) to head (a4270a5).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1728     +/-   ##
=======================================
+ Coverage   71.0%   71.3%   +0.3%     
=======================================
  Files        135     136      +1     
  Lines      20751   20799     +48     
=======================================
+ Hits       14746   14845     +99     
+ Misses      6005    5954     -51     

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[TommyCpp]

Errrr I don't think it worked?

[lalitb]

@TommyCpp Where do you see the issue? There was one failure I saw in CI which was related to this bug, but the rerun was successful.