[CI] Add timeout to codecov

[peterargue]

Recently, we've noticed some codecov jobs taking hours to complete. This PR upgrades the action to the latest version and adds a timeout. If the step fails due to a timeout, the job will continue without error

[sjonpaulbrown]

The move to v4 won't work without a token variable injected into the action. The move to v4 will break without the additional change. The failure can be seen here on the CI job.

https://github.com/codecov/codecov-action?tab=readme-ov-file#v4-release

For the time being, we can either keep it at v3, or we will likely want to add support for the token.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.66%. Comparing base (8afb152) to head (6223be9).
Report is 1148 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5770      +/-   ##
==========================================
- Coverage   56.00%   55.66%   -0.35%     
==========================================
  Files        1024     1094      +70     
  Lines       99327    85308   -14019     
==========================================
- Hits        55632    47487    -8145     
+ Misses      39455    33255    -6200     
- Partials     4240     4566     +326     

Flag	Coverage Δ
unittests	55.66% <ø> (-0.35%)	⬇️

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[peterargue]

reports seem to be working now with the updated token:
https://github.com/onflow/flow-go/actions/runs/8823148130/job/24222983697?pr=5770

[turbolent]

👏 🙏